PHP's str_rot13 in TypeScript

How to use

Install via yarn add locutus and import: import { str_rot13 } from 'locutus/php/strings/str_rot13'.

Or with CommonJS: const { str_rot13 } = require('locutus/php/strings/str_rot13')

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	str_rot13('Kevin van Zonneveld')	'Xriva ina Mbaariryq'
2	str_rot13('Xriva ina Mbaariryq')	'Kevin van Zonneveld'
3	str_rot13(33)	'33'

Here's what our current TypeScript equivalent to PHP's str_rot13 looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function str_rot13(str: string | number): string {
  //      discuss at: https://locutus.io/php/str_rot13/
  // parity verified: PHP 8.3
  //     original by: Jonas Raoni Soares Silva (https://www.jsfromhell.com)
  //     improved by: Ates Goral (https://magnetiq.com)
  //     improved by: Rafał Kukawski (https://blog.kukawski.pl)
  //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  //       example 1: str_rot13('Kevin van Zonneveld')
  //       returns 1: 'Xriva ina Mbaariryq'
  //       example 2: str_rot13('Xriva ina Mbaariryq')
  //       returns 2: 'Kevin van Zonneveld'
  //       example 3: str_rot13(33)
  //       returns 3: '33'

  return (str + '').replace(/[a-z]/gi, function (s) {
    return String.fromCharCode(s.charCodeAt(0) + (s.toLowerCase() < 'n' ? 13 : -13))
  })
}

export function str_rot13(str) {
  //      discuss at: https://locutus.io/php/str_rot13/
  // parity verified: PHP 8.3
  //     original by: Jonas Raoni Soares Silva (https://www.jsfromhell.com)
  //     improved by: Ates Goral (https://magnetiq.com)
  //     improved by: Rafał Kukawski (https://blog.kukawski.pl)
  //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  //       example 1: str_rot13('Kevin van Zonneveld')
  //       returns 1: 'Xriva ina Mbaariryq'
  //       example 2: str_rot13('Xriva ina Mbaariryq')
  //       returns 2: 'Kevin van Zonneveld'
  //       example 3: str_rot13(33)
  //       returns 3: '33'

  return (str + '').replace(/[a-z]/gi, function (s) {
    return String.fromCharCode(s.charCodeAt(0) + (s.toLowerCase() < 'n' ? 13 : -13))
  })
}

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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