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Update pickBy.md #39

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12 changes: 6 additions & 6 deletions docs/pickBy.md
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Expand Up @@ -14,14 +14,14 @@ image: https://www.positronx.io/wp-content/uploads/2018/11/positronx-banner-1152

Creates an object composed of the properties the given function returns truthy for. The function is invoked with two arguments: (value, key).

Use `Object.keys(obj)` and `Array.prototype.filter()`to remove the keys for which `fn` returns a falsy value.
Use `Array.prototype.reduce()` to convert the filtered keys back to an object with the corresponding key-value pairs.
Use `Object.entries(obj)` and `Object.fromEntries(obj)` to convert the object to a list of properties and convert back.
Use `Array.prototype.filter()`to remove the keys for which `fn` returns a falsy value.

```ts title="typescript"
const pickBy = (obj: AnyObject, fn: Function) =>
Object.keys(obj)
.filter((k) => fn(obj[k], k))
.reduce((acc, key) => ((acc[key] = obj[key]), acc), {} as AnyObject);
const pickBy = (
o: Record<string, any>,
fn: (value: any) => Boolean = (x) => x,
) => Object.fromEntries(Object.entries(o).filter(([, v]) => fn(v)))
```

```ts title="typescript"
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