PHP's hex2bin in TypeScript

How to use

Install via yarn add locutus and import: import { hex2bin } from 'locutus/php/strings/hex2bin'.

Or with CommonJS: const { hex2bin } = require('locutus/php/strings/hex2bin')

Use a bundler that supports tree-shaking so you only ship the functions you actually use. Vite, webpack, Rollup, and Parcel all handle this. For server-side use this is less of a concern.

Examples

These examples are extracted from test cases that automatically verify our functions against their native counterparts.

#	code	expected result
1	hex2bin('44696d61')	'Dima'
2	hex2bin('00')	'\x00'
3	hex2bin('2f1q')	false

Here's what our current TypeScript equivalent to PHP's hex2bin looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

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export function hex2bin(s: string | number): string | false {
  //      discuss at: https://locutus.io/php/hex2bin/
  // parity verified: PHP 8.3
  //     original by: Dumitru Uzun (https://duzun.me)
  //       example 1: hex2bin('44696d61')
  //       returns 1: 'Dima'
  //       example 2: hex2bin('00')
  //       returns 2: '\x00'
  //       example 3: hex2bin('2f1q')
  //       returns 3: false

  const ret: number[] = []

  const input = String(s)

  for (let i = 0; i < input.length; i += 2) {
    const c = Number.parseInt(input.substring(i, i + 1), 16)
    const k = Number.parseInt(input.substring(i + 1, i + 2), 16)
    if (Number.isNaN(c) || Number.isNaN(k)) {
      return false
    }
    ret.push((c << 4) | k)
  }

  return String.fromCharCode.apply(String, ret)
}

export function hex2bin(s) {
  //      discuss at: https://locutus.io/php/hex2bin/
  // parity verified: PHP 8.3
  //     original by: Dumitru Uzun (https://duzun.me)
  //       example 1: hex2bin('44696d61')
  //       returns 1: 'Dima'
  //       example 2: hex2bin('00')
  //       returns 2: '\x00'
  //       example 3: hex2bin('2f1q')
  //       returns 3: false

  const ret = []

  const input = String(s)

  for (let i = 0; i < input.length; i += 2) {
    const c = Number.parseInt(input.substring(i, i + 1), 16)
    const k = Number.parseInt(input.substring(i + 1, i + 2), 16)
    if (Number.isNaN(c) || Number.isNaN(k)) {
      return false
    }
    ret.push((c << 4) | k)
  }

  return String.fromCharCode.apply(String, ret)
}

Improve this function

Locutus is a community effort following The McDonald's Theory: we ship first iterations, hoping others will improve them. If you see something that could be better, we'd love your contribution.

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