phpjs/_octopress/source/functions/chr/index.markdown

php.js offers community built php functions in javascript

---
layout: page
title: "JavaScript chr function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/chr:368
- /functions/view/chr
- /functions/view/368
- /functions/chr:368
- /functions/368
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's chr

{% codeblock strings/chr.js lang:js https://raw.github.com/kvz/phpjs/master/functions/strings/chr.js raw on github %}
function chr (codePt) {
  // From: http://phpjs.org/functions
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: chr(75);
  // *     returns 1: 'K'
  // *     example 1: chr(65536) === '\uD800\uDC00';
  // *     returns 1: true
  if (codePt > 0xFFFF) { // Create a four-byte string (length 2) since this code point is high
    //   enough for the UTF-16 encoding (JavaScript internal use), to
    //   require representation with two surrogates (reserved non-characters
    //   used for building other characters; the first is "high" and the next "low")
    codePt -= 0x10000;
    return String.fromCharCode(0xD800 + (codePt >> 10), 0xDC00 + (codePt & 0x3FF));
  }
  return String.fromCharCode(codePt);
}
{% endcodeblock %}

 - [Raw function on GitHub](https://github.com/kvz/phpjs/blob/master/functions/strings/chr.js)

Please note that php.js uses JavaScript objects as substitutes for PHP arrays, they are 
the closest match to this hashtable-like data structure. 

Please also note that php.js offers community built functions and goes by the 
[McDonald's Theory](https://medium.com/what-i-learned-building/9216e1c9da7d). We'll put online 
functions that are far from perfect, in the hopes to spark better contributions. 
Do you have one? Then please just: 

 - [Edit on GitHub](https://github.com/kvz/phpjs/edit/master/functions/strings/chr.js)

### Example 1
This code
{% codeblock lang:js example %}
chr(75);
chr(65536) === '\uD800\uDC00';
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'K'
true
{% endcodeblock %}


### Other PHP functions in the strings extension
{% render_partial _includes/custom/strings.html %}