PHP's ord in JavaScript

How to use

You you can install via yarn add locutus and require this function via const ord = require('locutus/php/strings/ord').

It is important to use a bundler that supports tree-shaking so that you only ship the functions that you actually use to your browser, instead of all of Locutus, which is massive. Examples are: Parcel, webpack, or rollup.js. For server-side use this is typically less of a concern.

Examples

Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#	code	expected result
1	ord('K')	75
2	ord('\uD800\uDC00'); // surrogate pair to create a single Unicode character	65536

Here’s what our current JavaScript equivalent to PHP's ord looks like.

module.exports = function ord(string) {
  //  discuss at: https://locutus.io/php/ord/
  // original by: Kevin van Zonneveld (https://kvz.io)
  // bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  // improved by: Brett Zamir (https://brett-zamir.me)
  //    input by: incidence
  //   example 1: ord('K')
  //   returns 1: 75
  //   example 2: ord('\uD800\uDC00'); // surrogate pair to create a single Unicode character
  //   returns 2: 65536

  const str = string + ''
  const code = str.charCodeAt(0)

  if (code >= 0xd800 && code <= 0xdbff) {
    // High surrogate (could change last hex to 0xDB7F to treat
    // high private surrogates as single characters)
    const hi = code
    if (str.length === 1) {
      // This is just a high surrogate with no following low surrogate,
      // so we return its value;
      return code
      // we could also throw an error as it is not a complete character,
      // but someone may want to know
    }
    const low = str.charCodeAt(1)
    return (hi - 0xd800) * 0x400 + (low - 0xdc00) + 0x10000
  }
  if (code >= 0xdc00 && code <= 0xdfff) {
    // Low surrogate
    // This is just a low surrogate with no preceding high surrogate,
    // so we return its value;
    return code
    // we could also throw an error as it is not a complete character,
    // but someone may want to know
  }

  return code
}

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we assimilate first iterations with imperfections, hoping for others to take issue with-and improve them. This unorthodox approach has worked very well to foster fun and fruitful collaboration, but please be reminded to use our creations at your own risk. THE SOFTWARE IS PROVIDED "AS IS" has never been more true than for Locutus.

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