Completed first task #40
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WalkthroughChecked two README checklist items, changed VS Code ESLint save mode to "explicit", implemented many object/array and string/number utility functions in kata exercises, and bumped the Jest devDependency from ^26.2.2 to ^30.0.5. Changes
Sequence Diagram(s)(No sequence diagram generated — changes are implementations of utility functions and configuration edits, not a new or modified control flow between components.) Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Pre-merge checks and finishing touches❌ Failed checks (1 warning, 1 inconclusive)
✅ Passed checks (1 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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…back (stopped at "Stand in line") Moving on to task 3
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🧹 Nitpick comments (1)
.vscode/settings.json (1)
8-10:"explicit"stops auto-fixing on save — confirm this is intended and VS Code ≥ 1.78 is in use
Switchingsource.fixAll.eslintfrom the booleantrueto the string"explicit"means ESLint fixes are not executed automatically on save; they only run when the user explicitly invokes the “Fix all” code action.
• If you still want auto-fix-on-save, use"always"(or revert totrue).
•"explicit"requires relatively recent VS Code versions; older setups will silently ignore it.
Please verify that this behaviour change and version requirement match team expectations.
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Actionable comments posted: 1
🧹 Nitpick comments (1)
3-JSKata/1-objects-and-arrays/kata.js (1)
13-21: Consider making the function more flexible.The function correctly increments the age by 1, but it hardcodes
nameandageproperty. Consider whether these hardcoded values are intentional for specific tests, or if the function should preserve/copy other properties from the input object.If you want a more flexible implementation that preserves existing properties:
function ageOneYear(obj) { - const newObj = { - name: 'Mickey Mouse', - age: obj.age + 1, - email: '[email protected]', - } - - return newObj + return { + ...obj, + age: obj.age + 1 + } }
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🔇 Additional comments (1)
3-JSKata/1-objects-and-arrays/kata.js (1)
7-9: LGTM! Simple and correct implementation.The function correctly concatenates 'Hello ' with the name parameter as specified. Consider adding input validation if you want to handle edge cases like
undefinedornullvalues for the name parameter.
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Actionable comments posted: 1
🧹 Nitpick comments (1)
3-JSKata/1-objects-and-arrays/kata.js (1)
45-51: Consider using object spread syntax for cleaner code.The implementation is correct but could be simplified as hinted in the comment. Consider using spread syntax for more concise code:
-function addName(obj, name) { - const objectAddName = Object.assign({}, obj) - - objectAddName.name = name - - return objectAddName -} +function addName(obj, name) { + return { ...obj, name } +}
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🔇 Additional comments (6)
3-JSKata/1-objects-and-arrays/kata.js (6)
7-9: LGTM!Simple and correct string concatenation implementation that meets the requirements.
13-21: LGTM with note on hardcoded values.The implementation correctly increments the age property. Note that this function hardcodes
nameand
28-34: LGTM!Correct implementation using computed property syntax to create dynamic property names. The previous issue with literal property names has been properly addressed.
38-40: LGTM!Correct and concise implementation for dynamic property value access.
56-62: LGTM!Correct implementation using
Object.assignfor copying and thedeleteoperator to remove the property as suggested in the comment.
76-78: LGTM!Correct and concise use of
Object.keys()to return an array of object property names.
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Actionable comments posted: 1
♻️ Duplicate comments (1)
3-JSKata/1-objects-and-arrays/kata.js (1)
68-72: Fix falsy value check logic.The current implementation still has the same issues identified in the previous review:
- Uses loose equality
==which only checks againstfalse, missing other falsy values (0, "", null, undefined, NaN)- Doesn't explicitly handle the truthy case
Apply this diff to fix the falsy check:
function returnErrorIfFalsy(val) { - if (val == false) { + if (!val) { return new Error('Oh no, an error!') } }
🧹 Nitpick comments (3)
3-JSKata/1-objects-and-arrays/kata.js (3)
45-51: Consider using object spread syntax for cleaner code.The implementation is correct, but could be simplified using modern JavaScript syntax.
Consider this more concise approach:
function addName(obj, name) { - const objectAddName = Object.assign({}, obj) - - objectAddName.name = name - - return objectAddName + return { + ...obj, + name: name + } }
56-62: Consider using destructuring for cleaner property deletion.The implementation is correct, but could be modernized using destructuring assignment.
Consider this more modern approach:
function deleteProperty(obj, key) { - const objectDeleteProperty = Object.assign({}, obj) - - delete objectDeleteProperty[key] - - return objectDeleteProperty + const { [key]: deleted, ...rest } = obj + return rest }
93-101: Consider using Array.fill() for better performance.The implementation is correct, but can be simplified and optimized using built-in array methods.
Consider this more efficient approach:
function makeArrayOfItem(item, length) { - const myArray = [] - - for (let i = 0; i < length; i++) { - myArray.push(item) - } - - return myArray + return new Array(length).fill(item) }
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🔇 Additional comments (6)
3-JSKata/1-objects-and-arrays/kata.js (6)
7-9: LGTM!Simple and correct implementation that meets the requirements.
28-34: LGTM!The previous issue with literal property names has been correctly fixed. The function now properly uses dynamic property assignment with bracket notation.
38-40: LGTM!Correct implementation using bracket notation for dynamic property access.
76-78: LGTM!Perfect implementation using the standard
Object.keys()method.
82-84: LGTM!Perfect implementation using the standard
Object.values()method.
105-107: LGTM!Excellent use of rest parameters with a clear understanding comment. This is the optimal implementation.
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Actionable comments posted: 2
♻️ Duplicate comments (2)
3-JSKata/1-objects-and-arrays/kata.js (2)
13-21: Fix hardcoded property values.The function still hardcodes
nameandApply this diff to properly copy all properties and only modify the age:
function ageOneYear(obj) { - const newObj = { - name: 'Mickey Mouse', - age: obj.age + 1, - email: '[email protected]', - } - - return newObj + return { + ...obj, + age: obj.age + 1 + } }
68-72: Fix falsy value check logic.The current implementation still has the issues identified previously:
- Uses loose equality
==which only checks againstfalse, missing other falsy values (0, "", null, undefined, NaN)- Doesn't explicitly handle the truthy case
Apply this diff to fix the falsy check:
function returnErrorIfFalsy(val) { - if (val == false) { + if (!val) { return new Error('Oh no, an error!') } + return val }
🧹 Nitpick comments (3)
3-JSKata/1-objects-and-arrays/kata.js (3)
45-51: Consider using spread syntax as suggested in the comment.While your implementation is correct, you can make it more concise using the spread syntax as mentioned in the comment:
function addName(obj, name) { - const objectAddName = Object.assign({}, obj) - - objectAddName.name = name - - return objectAddName + return { + ...obj, + name: name + } }
93-101: Consider a more concise implementation.While your loop-based approach works correctly, you can use
Array.from()orArray.fill()for a more concise solution:function makeArrayOfItem(item, length) { - const myArray = [] - - for (let i = 0; i < length; i++) { - myArray.push(item) - } - - return myArray + return Array(length).fill(item) }
136-168: Multiple functions are not implemented.The following functions have empty implementations:
replaceItemAtIndex(line 136)insertItemAtIndex(line 140)deleteItemAtIndex(line 144)deleteItem(line 147)zipObject(line 152)unzipObject(line 157)findOneByProperty(line 164)findAll(line 168)These functions need to be implemented to complete the kata exercises.
Would you like me to help implement these functions or open issues to track their implementation?
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3-JSKata/1-objects-and-arrays/kata.js (2)
3-JSKata/1-objects-and-arrays/1-tests/addName.test.js (2)
name(5-5)obj(6-8)3-JSKata/1-objects-and-arrays/1-tests/hasItem.test.js (2)
arr(5-5)arr(16-16)
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3-JSKata/1-objects-and-arrays/kata.js
[error] 113-113: This code will never be reached ...
... because either this statement ...
... or this statement will return from the function beforehand
(lint/correctness/noUnreachable)
🔇 Additional comments (7)
3-JSKata/1-objects-and-arrays/kata.js (7)
7-9: Function implementation looks good.The
getGreetingfunction correctly concatenates the greeting string with the provided name.
28-34: Good fix for dynamic property creation.The function now correctly uses bracket notation to create an object with a dynamic property name, addressing the previous issue.
38-40: Property access implementation is correct.The function properly uses bracket notation to access and return the property value.
56-62: Correct implementation of property deletion.The function properly creates a copy of the object and uses the delete operator to remove the specified property.
76-78: Correct usage of Object.keys().The function properly returns an array of the object's property names.
82-84: Correct usage of Object.values().The function properly returns an array of the object's values.
105-107: Correct use of rest parameters.The function properly uses rest parameters to capture all arguments into an array. Good explanatory comment.
…s some minor code optiumizations
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Actionable comments posted: 3
♻️ Duplicate comments (2)
3-JSKata/1-objects-and-arrays/kata.js (2)
111-119: Critical logic error: function returns false prematurely.
123-130: Incorrect index validation logic.
🧹 Nitpick comments (3)
3-JSKata/1-objects-and-arrays/kata.js (3)
44-50: Consider using spread operator for consistency.While your implementation is correct, you could simplify it using the spread operator for better readability:
function addName(obj, name) { - const objectAddName = Object.assign({}, obj) - - objectAddName.name = name - - return objectAddName + return { ...obj, name } }
55-61: Consider using destructuring for a cleaner approach.Your implementation is correct, but you could use object destructuring with rest syntax for a more modern approach:
function deleteProperty(obj, key) { - const objectDeleteProperty = Object.assign({}, obj) - - delete objectDeleteProperty[key] - - return objectDeleteProperty + const { [key]: _, ...rest } = obj + return rest }
92-100: Consider using Array methods for cleaner code.Your implementation works correctly, but you could simplify it using
Array.from()ornew Array().fill():function makeArrayOfItem(item, length) { - const myArray = [] - - for (let i = 0; i < length; i++) { - myArray.push(item) - } - - return myArray + return new Array(length).fill(item) }
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3-JSKata/1-objects-and-arrays/kata.js
[error] 112-112: This code will never be reached ...
... because either this statement ...
... or this statement will return from the function beforehand
(lint/correctness/noUnreachable)
🔇 Additional comments (7)
3-JSKata/1-objects-and-arrays/kata.js (7)
7-9: LGTM!The greeting function is implemented correctly.
13-20: Great fix!The implementation correctly uses the spread operator to preserve all original properties while only incrementing the age. This properly addresses the previous concern about hardcoded values.
27-33: Well done!The implementation correctly uses bracket notation for dynamic property assignment, properly addressing the previous issue with literal property names.
37-39: LGTM!Correct implementation of property access.
75-77: LGTM!Correct use of
Object.keys().
81-83: LGTM!Correct use of
Object.values().
104-106: Excellent use of rest parameters!Clean and correct implementation.
| function replaceItemAtIndex(arr, idx, item) { | ||
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| for (let i = 0; i < arr.length; i++) { | ||
| tempArray[i] = arr[i] | ||
| if (arr[i] == arr[idx]) { | ||
| tempArray[i] = item | ||
| } | ||
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| return tempArray | ||
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Fix index comparison logic.
The function incorrectly compares array values instead of indices, which could replace multiple elements with the same value.
function replaceItemAtIndex(arr, idx, item) {
- const tempArray = []
-
- for (let i = 0; i < arr.length; i++) {
- tempArray[i] = arr[i]
- if (arr[i] == arr[idx]) {
- tempArray[i] = item
- }
- }
-
- return tempArray
+ const newArr = [...arr]
+ if (idx >= 0 && idx < arr.length) {
+ newArr[idx] = item
+ }
+ return newArr
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| function replaceItemAtIndex(arr, idx, item) { | |
| const tempArray = [] | |
| for (let i = 0; i < arr.length; i++) { | |
| tempArray[i] = arr[i] | |
| if (arr[i] == arr[idx]) { | |
| tempArray[i] = item | |
| } | |
| } | |
| return tempArray | |
| } | |
| function replaceItemAtIndex(arr, idx, item) { | |
| const newArr = [...arr] | |
| if (idx >= 0 && idx < arr.length) { | |
| newArr[idx] = item | |
| } | |
| return newArr | |
| } |
🤖 Prompt for AI Agents
In 3-JSKata/1-objects-and-arrays/kata.js around lines 135 to 146, the function
replaceItemAtIndex incorrectly compares array values instead of indices in the
loop, causing multiple replacements if values match. Fix this by changing the
condition to compare the current index i with the target index idx, so only the
element at idx is replaced with item.
| function insertItemAtIndex(arr, item, idx) { | ||
| const tempArray = [] | ||
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| for (let i = 0; i < arr.length; i++) { | ||
| tempArray[i] = arr[i] | ||
| if (i == idx) { | ||
| tempArray.splice(i, 0, item) | ||
| } | ||
| } | ||
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| return tempArray | ||
| } |
There was a problem hiding this comment.
Fix array insertion logic.
The current implementation modifies the array during iteration and doesn't correctly handle insertion. Use array methods for a cleaner solution:
function insertItemAtIndex(arr, item, idx) {
- const tempArray = []
-
- for (let i = 0; i < arr.length; i++) {
- tempArray[i] = arr[i]
- if (i == idx) {
- tempArray.splice(i, 0, item)
- }
- }
-
- return tempArray
+ return [...arr.slice(0, idx), item, ...arr.slice(idx)]
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| function insertItemAtIndex(arr, item, idx) { | |
| const tempArray = [] | |
| for (let i = 0; i < arr.length; i++) { | |
| tempArray[i] = arr[i] | |
| if (i == idx) { | |
| tempArray.splice(i, 0, item) | |
| } | |
| } | |
| return tempArray | |
| } | |
| function insertItemAtIndex(arr, item, idx) { | |
| return [...arr.slice(0, idx), item, ...arr.slice(idx)] | |
| } |
🤖 Prompt for AI Agents
In 3-JSKata/1-objects-and-arrays/kata.js lines 150 to 161, the current
insertItemAtIndex function incorrectly modifies the array during iteration and
does not insert the item properly. To fix this, avoid modifying the array inside
the loop; instead, create a new array by slicing the original array up to the
index, then add the new item, and finally concatenate the remaining elements
from the original array after the index. Return this new array as the result.
…th function deleteItem.moving on to strings and numbers
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Actionable comments posted: 2
♻️ Duplicate comments (5)
3-JSKata/1-objects-and-arrays/kata.js (5)
67-71: Add explicit return for truthy values.The falsy check is correct, but the function returns
undefinedfor truthy values. Consider adding an explicit return statement:function returnErrorIfFalsy(val) { if (!val) { return new Error('Oh no, an error!') } + return val }
111-119: Critical logic error: function returns false prematurely.The function returns
falseimmediately if the first element doesn't match, preventing it from checking the remaining elements. This makes most of the loop unreachable.Apply this diff to fix the logic:
function hasItem(arr, item) { - for (let i = 0; i < arr.length; i++) { - if (arr[i] == item) { - return true - } else { - return false - } - } + return arr.includes(item) }Alternatively, if you prefer to keep the loop approach:
function hasItem(arr, item) { for (let i = 0; i < arr.length; i++) { if (arr[i] == item) { return true - } else { - return false } } + return false }
135-146: Fix index comparison logic.The function incorrectly compares array values instead of indices, which could replace multiple elements with the same value.
function replaceItemAtIndex(arr, idx, item) { - const tempArray = [] - - for (let i = 0; i < arr.length; i++) { - tempArray[i] = arr[i] - if (arr[i] == arr[idx]) { - tempArray[i] = item - } - } - - return tempArray + const newArr = [...arr] + if (idx >= 0 && idx < arr.length) { + newArr[idx] = item + } + return newArr }
150-161: Fix array insertion logic.The current implementation modifies the array during iteration and doesn't correctly handle insertion. Use array methods for a cleaner solution:
function insertItemAtIndex(arr, item, idx) { - const tempArray = [] - - for (let i = 0; i < arr.length; i++) { - tempArray[i] = arr[i] - if (i == idx) { - tempArray.splice(i, 0, item) - } - } - - return tempArray + return [...arr.slice(0, idx), item, ...arr.slice(idx)] }
123-130: Simplify index validation logic.While your implementation works, it's unnecessarily complex. Simply validate the index bounds:
function getItemAtIndex(arr, idx) { - for (let i = 0; i < arr.length; i++) { - if (i == idx) { - return arr[i] - } - } - return new Error() + if (idx >= 0 && idx < arr.length) { + return arr[idx] + } + return new Error('Index out of bounds') }
🧹 Nitpick comments (3)
3-JSKata/1-objects-and-arrays/kata.js (3)
44-50: Consider using spread syntax for consistency.While your implementation is correct, you could simplify it using the spread syntax as suggested in the comment:
-function addName(obj, name) { - const objectAddName = Object.assign({}, obj) - - objectAddName.name = name - - return objectAddName -} +function addName(obj, name) { + return { ...obj, name } +}
55-61: Consider using destructuring for cleaner code.Your implementation works correctly. For a more modern approach:
-function deleteProperty(obj, key) { - const objectDeleteProperty = Object.assign({}, obj) - - delete objectDeleteProperty[key] - - return objectDeleteProperty -} +function deleteProperty(obj, key) { + const { [key]: _, ...rest } = obj + return rest +}
92-100: Consider using Array methods for cleaner code.Your implementation works correctly. For a more concise approach:
-function makeArrayOfItem(item, length) { - const myArray = [] - - for (let i = 0; i < length; i++) { - myArray.push(item) - } - - return myArray -} +function makeArrayOfItem(item, length) { + return Array(length).fill(item) +}
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🧬 Code Graph Analysis (1)
3-JSKata/1-objects-and-arrays/kata.js (2)
3-JSKata/1-objects-and-arrays/1-tests/addName.test.js (2)
name(5-5)obj(6-8)3-JSKata/1-objects-and-arrays/1-tests/hasItem.test.js (2)
arr(5-5)arr(16-16)
🪛 Biome (2.1.2)
3-JSKata/1-objects-and-arrays/kata.js
[error] 112-112: This code will never be reached ...
... because either this statement ...
... or this statement will return from the function beforehand
(lint/correctness/noUnreachable)
🔇 Additional comments (6)
3-JSKata/1-objects-and-arrays/kata.js (6)
7-9: Implementation looks good!The greeting function correctly concatenates the string as expected.
13-20: Well implemented with proper object cloning!The function correctly uses the spread operator to preserve all original properties while only incrementing the age, addressing previous concerns about hardcoded values.
27-33: Correct dynamic property implementation!The function properly uses bracket notation to create an object with a dynamic key.
37-39: Clean property accessor implementation!
75-83: Excellent use of built-in methods!Both functions correctly utilize
Object.keys()andObject.values().
104-106: Perfect use of rest parameters!
| function deleteItemAtIndex(arr, idx) { | ||
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| for (let i = 0; i < arr.length; i++) { | ||
| tempArray[i] = arr[i] | ||
| if (i == idx) { | ||
| tempArray.splice(idx, 1) | ||
| } | ||
| } | ||
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| return tempArray | ||
| } |
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🛠️ Refactor suggestion
Simplify deletion logic.
The current approach modifies the array during iteration. Use a cleaner solution:
function deleteItemAtIndex(arr, idx) {
- const tempArray = []
-
- for (let i = 0; i < arr.length; i++) {
- tempArray[i] = arr[i]
- if (i == idx) {
- tempArray.splice(idx, 1)
- }
- }
-
- return tempArray
+ return arr.filter((_, index) => index !== idx)
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| function deleteItemAtIndex(arr, idx) { | |
| const tempArray = [] | |
| for (let i = 0; i < arr.length; i++) { | |
| tempArray[i] = arr[i] | |
| if (i == idx) { | |
| tempArray.splice(idx, 1) | |
| } | |
| } | |
| return tempArray | |
| } | |
| function deleteItemAtIndex(arr, idx) { | |
| return arr.filter((_, index) => index !== idx) | |
| } |
🤖 Prompt for AI Agents
In 3-JSKata/1-objects-and-arrays/kata.js around lines 165 to 176, the function
deleteItemAtIndex modifies the array while iterating, which is inefficient and
error-prone. Instead, create a new array by filtering out the element at the
given index or use array slicing to exclude the item at idx. This will simplify
the logic and avoid modifying the array during iteration.
| function deleteItem(arr, item) { | ||
| for (let i = 0; i < arr.length; i++) { | ||
| if (arr[i] == item) { | ||
| arr.splice(i, 0, item) | ||
| } | ||
| } | ||
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| return arr | ||
| } |
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Critical: Function mutates input and uses incorrect splice parameters.
The function has two major issues:
- It mutates the original array instead of returning a new one
splice(i, 0, item)inserts the item instead of removing it
Apply this fix:
function deleteItem(arr, item) {
- for (let i = 0; i < arr.length; i++) {
- if (arr[i] == item) {
- arr.splice(i, 0, item)
- }
- }
-
- return arr
+ return arr.filter(el => el !== item)
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| function deleteItem(arr, item) { | |
| for (let i = 0; i < arr.length; i++) { | |
| if (arr[i] == item) { | |
| arr.splice(i, 0, item) | |
| } | |
| } | |
| return arr | |
| } | |
| function deleteItem(arr, item) { | |
| return arr.filter(el => el !== item) | |
| } |
🤖 Prompt for AI Agents
In 3-JSKata/1-objects-and-arrays/kata.js around lines 179 to 187, the deleteItem
function incorrectly mutates the input array and uses splice with parameters
that insert the item instead of removing it. To fix this, avoid mutating the
original array by creating and returning a new array that excludes the specified
item, and remove the incorrect splice call that inserts the item. Use a method
like filter to return a new array without the item.
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Actionable comments posted: 0
🧹 Nitpick comments (2)
3-JSKata/2-strings-and-numbers/utilities.js (2)
5-11: Simplify the boolean logic.The function works correctly but can be simplified by directly returning the boolean result of the comparison instead of using an if-else statement.
function isNumber(thing) { - if (typeof thing === 'number') { - return true - } else { - return false - } + return typeof thing === 'number' }
13-15: Consider edge case handling for invalid inputs.The
toNumberfunction correctly uses theNumberconstructor for conversion. However, consider thatNumber(undefined)returnsNaN,Number(null)returns0, andNumber("")returns0. Depending on the kata requirements, you might want to handle these edge cases explicitly.If stricter validation is needed, consider:
function toNumber(str) { + // Consider adding validation for empty strings or null/undefined return Number(str) }
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3-JSKata/2-strings-and-numbers/utilities.js (1)
1-3: Simple and correct implementation.The
getTypefunction correctly uses thetypeofoperator to return the JavaScript type of the input parameter.
…ers. porbly skip isEmail. also added some other minor fixes to other functions
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Actionable comments posted: 2
♻️ Duplicate comments (5)
3-JSKata/1-objects-and-arrays/kata.js (5)
165-176: Simplify deletion logic.The current approach modifies the array during iteration. Use a cleaner solution with array methods.
function deleteItemAtIndex(arr, idx) { - const tempArray = [] - - for (let i = 0; i < arr.length; i++) { - tempArray[i] = arr[i] - if (i == idx) { - tempArray.splice(idx, 1) - } - } - - return tempArray + return arr.filter((_, index) => index !== idx) }
112-119: Critical: Function returns false prematurely.The function returns
falseimmediately if the first element doesn't match, preventing it from checking the remaining elements.Apply this diff to fix the logic:
function hasItem(arr, item) { for (let i = 0; i < arr.length; i++) { - if (arr[i] == item) { + if (arr[i] === item) { return true - } else { - return false } } + return false }Or use the built-in method:
function hasItem(arr, item) { - for (let i = 0; i < arr.length; i++) { - if (arr[i] == item) { - return true - } else { - return false - } - } + return arr.includes(item) }
135-146: Fix index comparison logic.The function incorrectly compares array values (
arr[i] == arr[idx]) instead of indices, which will replace all elements with the same value as the element at indexidx.Apply this diff:
function replaceItemAtIndex(arr, idx, item) { - const tempArray = [] - - for (let i = 0; i < arr.length; i++) { - tempArray[i] = arr[i] - if (arr[i] == arr[idx]) { - tempArray[i] = item - } - } - - return tempArray + const newArr = [...arr] + if (idx >= 0 && idx < arr.length) { + newArr[idx] = item + } + return newArr }
150-161: Fix array insertion logic.The implementation modifies the array during iteration with
splice, which can lead to incorrect behavior. Use a cleaner approach with array slicing.Apply this diff:
function insertItemAtIndex(arr, item, idx) { - const tempArray = [] - - for (let i = 0; i < arr.length; i++) { - tempArray[i] = arr[i] - if (i == idx) { - tempArray.splice(i, 0, item) - } - } - - return tempArray + return [...arr.slice(0, idx), item, ...arr.slice(idx)] }
179-187: Critical: Function mutates input and uses incorrect splice parameters.The function has two major issues:
- It mutates the original array instead of returning a new one
splice(i, 0, item)inserts the item instead of removing it (should besplice(i, 1))Apply this fix:
function deleteItem(arr, item) { - for (let i = 0; i < arr.length; i++) { - if (arr[i] == item) { - arr.splice(i, 0, item) - } - } - - return arr + return arr.filter(el => el !== item) }
🧹 Nitpick comments (7)
3-JSKata/2-strings-and-numbers/utilities.js (2)
5-11: Consider simplifying the boolean return.The logic is correct, but the if-else can be eliminated by returning the boolean expression directly.
Apply this diff to simplify:
function isNumber(thing) { - if (typeof thing === 'number') { - return true - } else { - return false - } + return typeof thing === 'number' }
29-35: Specify radix inparseIntcalls.Always provide the radix parameter to
parseIntto avoid unexpected behavior with certain inputs (e.g., strings starting with "0").Apply this diff:
function addStrings(a, b) { - let num1 = parseInt(a) - let num2 = parseInt(b) + let num1 = parseInt(a, 10) + let num2 = parseInt(b, 10) let num3 = num1 + num2 return String(num3) }3-JSKata/1-objects-and-arrays/kata.js (5)
27-33: LGTM with optional simplification.The dynamic property issue has been correctly fixed. The implementation is clear, though it could be condensed.
For a more concise approach:
function makeObject(key, value) { - const newObj = {} - - newObj[key] = value - - return newObj + return { [key]: value } }
44-50: LGTM with optional simplification.The implementation correctly creates a shallow copy. For consistency with other functions in this file, consider using the spread operator.
function addName(obj, name) { - const objectAddName = Object.assign({}, obj) - - objectAddName.name = name - - return objectAddName + return { ...obj, name } }
55-61: LGTM with optional simplification.The implementation correctly creates a copy before deletion. For consistency, consider using the spread operator.
function deleteProperty(obj, key) { - const objectDeleteProperty = Object.assign({}, obj) - - delete objectDeleteProperty[key] - - return objectDeleteProperty + const result = { ...obj } + delete result[key] + return result }
93-101: LGTM with optional simplification.The loop-based approach is correct and easy to understand. For a more concise alternative, consider using
Array.fill().function makeArrayOfItem(item, length) { - const myArray = [] - - for (let i = 0; i < length; i++) { - myArray.push(item) - } - - return myArray + return Array(length).fill(item) }
123-130: Previous issue fixed, but consider simplification.The index validation logic has been corrected. However, the loop is unnecessary since array access is O(1).
function getItemAtIndex(arr, idx) { - for (let i = 0; i < arr.length; i++) { - if (i == idx) { - return arr[i] - } - } - return new Error() + if (idx >= 0 && idx < arr.length) { + return arr[idx] + } + return new Error('Index out of bounds') }
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3-JSKata/2-strings-and-numbers/utilities.js (9)
3-JSKata/3-data-structures/3-tests/getType.test.js (1)
getType(1-1)3-JSKata/2-strings-and-numbers/2-tests/getType.test.js (1)
getType(1-1)3-JSKata/2-strings-and-numbers/2-tests/isNumber.test.js (1)
isNumber(1-1)3-JSKata/2-strings-and-numbers/2-tests/toNumber.test.js (1)
toNumber(1-1)3-JSKata/2-strings-and-numbers/2-tests/isStringNumber.test.js (1)
isStringNumber(1-1)3-JSKata/2-strings-and-numbers/2-tests/add.test.js (1)
add(1-1)3-JSKata/2-strings-and-numbers/2-tests/addStrings.test.js (1)
addStrings(1-1)3-JSKata/2-strings-and-numbers/2-tests/addStringsOrNumbers.test.js (1)
addStringsOrNumbers(1-1)3-JSKata/2-strings-and-numbers/2-tests/isEmail.test.js (1)
isEmail(1-1)
3-JSKata/1-objects-and-arrays/kata.js (2)
3-JSKata/1-objects-and-arrays/1-tests/addName.test.js (2)
name(5-5)obj(6-8)3-JSKata/1-objects-and-arrays/1-tests/hasItem.test.js (2)
arr(5-5)arr(16-16)
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3-JSKata/2-strings-and-numbers/utilities.js
[error] 50-50: This code will never be reached ...
... because either this statement ...
... or this statement will return from the function beforehand
(lint/correctness/noUnreachable)
🔇 Additional comments (11)
3-JSKata/2-strings-and-numbers/utilities.js (4)
1-3: LGTM!Clean implementation of
getTypeusing thetypeofoperator.
13-15: LGTM!Correct use of
Number()for string-to-number conversion.
17-23: Verify the intended behavior for edge cases.The
isNaN()function has quirks that may not match expectations:
isNaN('')returnsfalse(empty string is coerced to 0)isNaN(' ')returnsfalse(whitespace is coerced to 0)isNaN(null)returnsfalse(null is coerced to 0)Ensure this behavior aligns with your requirements. If you need stricter validation, consider using
Number.isNaN(Number(str))or checkingtypeof str === 'string' && !isNaN(str) && str.trim() !== ''.
25-27: LGTM!The implementation correctly adds two values. Note that the
+operator will concatenate if either operand is a string.3-JSKata/1-objects-and-arrays/kata.js (7)
7-9: LGTM!Clean string concatenation implementation.
13-20: LGTM!The previous issue with hardcoded properties has been correctly addressed using the spread operator to preserve all properties while incrementing age.
37-39: LGTM!Correct property access using bracket notation.
67-72: LGTM!Both previous issues have been correctly addressed: the falsy check now uses
!val, and the function explicitly returns the value for truthy inputs.
76-78: LGTM!Correct use of
Object.keys().
82-84: LGTM!Correct use of
Object.values().
105-107: LGTM!Excellent use of rest parameters to capture all arguments as an array.
| function addStringsOrNumbers(a, b) { | ||
| let num1 = parseInt(a) | ||
| let num2 = parseInt(b) | ||
| let num3 = num1 + num2 | ||
|
|
||
| function addStringsOrNumbers(a, b) {} | ||
| if (isNumber(a) && isNumber(b)) { | ||
| return num3 | ||
| } else { | ||
| return String(num3) | ||
| } | ||
| } |
There was a problem hiding this comment.
Fix the type checking logic.
The function checks isNumber(a) and isNumber(b) after parsing them with parseInt, but it should check the original parameters before parsing to determine their types.
Apply this diff to fix the logic:
function addStringsOrNumbers(a, b) {
- let num1 = parseInt(a)
- let num2 = parseInt(b)
- let num3 = num1 + num2
-
if (isNumber(a) && isNumber(b)) {
- return num3
+ return a + b
} else {
- return String(num3)
+ return String(parseInt(a, 10) + parseInt(b, 10))
}
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| function addStringsOrNumbers(a, b) { | |
| let num1 = parseInt(a) | |
| let num2 = parseInt(b) | |
| let num3 = num1 + num2 | |
| function addStringsOrNumbers(a, b) {} | |
| if (isNumber(a) && isNumber(b)) { | |
| return num3 | |
| } else { | |
| return String(num3) | |
| } | |
| } | |
| function addStringsOrNumbers(a, b) { | |
| if (isNumber(a) && isNumber(b)) { | |
| return a + b | |
| } else { | |
| return String(parseInt(a, 10) + parseInt(b, 10)) | |
| } | |
| } |
🤖 Prompt for AI Agents
In 3-JSKata/2-strings-and-numbers/utilities.js around lines 37 to 47, the
function currently calls parseInt before checking types; change the logic to
first test the original parameters with isNumber(a) and isNumber(b), then parse
them (e.g., const num1 = parseInt(a); const num2 = parseInt(b)), compute the
sum, and finally return the numeric sum if both original inputs are numbers,
otherwise return the string form of the sum; ensure no type-checking uses the
parsed values.
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Actionable comments posted: 1
♻️ Duplicate comments (2)
3-JSKata/2-strings-and-numbers/utilities.js (2)
37-47: Fix the type checking logic.The function parses inputs before checking their types. It should check the original parameters first, then perform the appropriate operation based on their types. Additionally, missing radix parameters in
parseIntcalls can cause issues.This issue was already flagged in a previous review. Please refer to the earlier comment for the suggested fix.
49-63: Critical logic error: email validation always returns false.The condition checks if a single character equals all of '@', '.', 'c', 'o', and 'm' simultaneously, which is impossible. The function also returns on the first iteration, making the rest of the loop unreachable.
This issue was already flagged in a previous review. Please refer to the earlier comment for suggested fixes.
🧹 Nitpick comments (3)
3-JSKata/2-strings-and-numbers/utilities.js (3)
5-11: Simplify to a single return statement.The function logic is correct but can be more concise.
Apply this diff:
function isNumber(thing) { - if (typeof thing === 'number') { - return true - } else { - return false - } + return typeof thing === 'number' }
17-23: Simplify to a single return statement.The function logic is correct but can be more concise.
Apply this diff:
function isStringNumber(str) { - if (isNaN(str)) { - return false - } else { - return true - } + return !isNaN(str) }
65-74: Clarify the truthiness check.The loose inequality
!= falsehas subtle behavior: it will excludefalsebut include0,'',null,undefined, andNaN. If the intent is to count all truthy values, use a simple truthiness check. If the intent is to exclude onlyfalse, use strict inequality.For counting truthy values (recommended):
function countIf(array, fn) { let count = 0 for (let i = 0; i < array.length; i++) { - if (fn(array[i]) != false) { + if (fn(array[i])) { count += 1 } } return count }Or for excluding only
false(if that's the specific intent):- if (fn(array[i]) != false) { + if (fn(array[i]) !== false) {
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3-JSKata/2-strings-and-numbers/utilities.js(1 hunks)
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3-JSKata/2-strings-and-numbers/utilities.js (9)
3-JSKata/2-strings-and-numbers/2-tests/getType.test.js (1)
getType(1-1)3-JSKata/2-strings-and-numbers/2-tests/isNumber.test.js (1)
isNumber(1-1)3-JSKata/2-strings-and-numbers/2-tests/toNumber.test.js (1)
toNumber(1-1)3-JSKata/2-strings-and-numbers/2-tests/isStringNumber.test.js (1)
isStringNumber(1-1)3-JSKata/2-strings-and-numbers/2-tests/add.test.js (1)
add(1-1)3-JSKata/2-strings-and-numbers/2-tests/addStrings.test.js (1)
addStrings(1-1)3-JSKata/2-strings-and-numbers/2-tests/addStringsOrNumbers.test.js (1)
addStringsOrNumbers(1-1)3-JSKata/2-strings-and-numbers/2-tests/isEmail.test.js (1)
isEmail(1-1)3-JSKata/2-strings-and-numbers/2-tests/countIf.test.js (1)
countIf(1-1)
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3-JSKata/2-strings-and-numbers/utilities.js
[error] 50-50: This code will never be reached ...
... because either this statement ...
... or this statement will return from the function beforehand
(lint/correctness/noUnreachable)
🔇 Additional comments (3)
3-JSKata/2-strings-and-numbers/utilities.js (3)
1-3: LGTM!The implementation correctly returns the JavaScript type using
typeof.
13-15: LGTM!The implementation correctly converts the input to a number using
Number().
25-27: LGTM!The implementation correctly adds two values.
| function addStrings(a, b) { | ||
| let num1 = parseInt(a) | ||
| let num2 = parseInt(b) | ||
| let num3 = num1 + num2 | ||
|
|
||
| function isStringNumber(str) {} | ||
| return String(num3) | ||
| } |
There was a problem hiding this comment.
Add radix parameter to parseInt calls.
The parseInt function should always include a radix (base) parameter. Without it, strings with leading zeros could be interpreted as octal in older JavaScript environments, leading to unexpected results.
Apply this diff:
function addStrings(a, b) {
- let num1 = parseInt(a)
- let num2 = parseInt(b)
+ let num1 = parseInt(a, 10)
+ let num2 = parseInt(b, 10)
let num3 = num1 + num2
return String(num3)
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| function addStrings(a, b) { | |
| let num1 = parseInt(a) | |
| let num2 = parseInt(b) | |
| let num3 = num1 + num2 | |
| function isStringNumber(str) {} | |
| return String(num3) | |
| } | |
| function addStrings(a, b) { | |
| let num1 = parseInt(a, 10) | |
| let num2 = parseInt(b, 10) | |
| let num3 = num1 + num2 | |
| return String(num3) | |
| } |
🤖 Prompt for AI Agents
In 3-JSKata/2-strings-and-numbers/utilities.js around lines 29 to 35, the
parseInt calls omit the radix which can produce incorrect parsing for strings
with leading zeros; update both parseInt(a) and parseInt(b) to include an
explicit radix of 10 (e.g., parseInt(a, 10) and parseInt(b, 10)) so the values
are parsed as decimal before summing and returning the result as a string.
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