---
layout: page
title: "JavaScript strcspn function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/strcspn:534
- /functions/view/strcspn
- /functions/view/534
- /functions/strcspn:534
- /functions/534
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's strcspn

{% codeblock strings/strcspn.js lang:js https://raw.github.com/kvz/phpjs/master/functions/strings/strcspn.js raw on github %}
function strcspn (str, mask, start, length) {
  // From: http://phpjs.org/functions
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: strcspn('abcdefg123', '1234567890');
  // *     returns 1: 7
  // *     example 2: strcspn('123abc', '1234567890');
  // *     returns 2: 3
  start = start ? start : 0;
  var count = (length && ((start + length) < str.length)) ? start + length : str.length;
  strct: for (var i = start, lgth = 0; i < count; i++) {
    for (var j = 0; j < mask.length; j++) {
      if (str.charAt(i).indexOf(mask[j]) !== -1) {
        continue strct;
      }
    }++lgth;
  }

  return lgth;
}
{% endcodeblock %}

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

### Example 1
This code
{% codeblock lang:js example %}
strcspn('abcdefg123', '1234567890');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
7
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
strcspn('123abc', '1234567890');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
3
{% endcodeblock %}


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