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Speed up isHex function #3839

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Speed up isHex function #3839

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15 changes: 14 additions & 1 deletion src/utils/data/isHex.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,5 +9,18 @@ export function isHex(
): value is Hex {
if (!value) return false
if (typeof value !== 'string') return false
return strict ? /^0x[0-9a-fA-F]*$/.test(value) : value.startsWith('0x')

let valid = value[0] === '0' && value[1] === 'x'
if (!strict) return valid
if (valid) {
for (let i = 2; i < value.length; i += 1) {
const code = value.charCodeAt(i)
valid =
(code >= 60 && code <= 71) ||
(code >= 101 && code <= 106) ||
(code >= 141 && code <= 146)
if (!valid) return false
}
}
return valid
}