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

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---
layout: page
title: "JavaScript settype function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/settype:511
- /functions/view/settype
- /functions/view/511
- /functions/settype:511
- /functions/511
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's settype

{% codeblock var/settype.js lang:js https://raw.github.com/kvz/phpjs/master/functions/var/settype.js raw on github %}
function settype (vr, type) {
  // From: http://phpjs.org/functions
  // +   original by: Waldo Malqui Silva
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +    revised by: Brett Zamir (http://brett-zamir.me)
  // %        note 1: Credits to Crockford also
  // %        note 2: only works on global variables, and "vr" must be passed in as a string
  // *     example 1: foo = '5bar';
  // *     example 1: settype('foo', 'integer');
  // *     results 1: foo === 5
  // *     returns 1: true
  // *     example 2: foo = true;
  // *     example 2: settype('foo', 'string');
  // *     results 2: foo === '1'
  // *     returns 2: true
  var is_array = function (arr) {
    return typeof arr === 'object' && typeof arr.length === 'number' && !(arr.propertyIsEnumerable('length')) && typeof arr.splice === 'function';
  };
  var v, mtch, i, obj;
  v = this[vr] ? this[vr] : vr;

  try {
    switch (type) {
    case 'boolean':
      if (is_array(v) && v.length === 0) {
        this[vr] = false;
      } else if (v === '0') {
        this[vr] = false;
      } else if (typeof v === 'object' && !is_array(v)) {
        var lgth = false;
        for (i in v) {
          lgth = true;
        }
        this[vr] = lgth;
      } else {
        this[vr] = !! v;
      }
      break;
    case 'integer':
      if (typeof v === 'number') {
        this[vr] = parseInt(v, 10);
      } else if (typeof v === 'string') {
        mtch = v.match(/^([+\-]?)(\d+)/);
        if (!mtch) {
          this[vr] = 0;
        } else {
          this[vr] = parseInt(v, 10);
        }
      } else if (v === true) {
        this[vr] = 1;
      } else if (v === false || v === null) {
        this[vr] = 0;
      } else if (is_array(v) && v.length === 0) {
        this[vr] = 0;
      } else if (typeof v === 'object') {
        this[vr] = 1;
      }

      break;
    case 'float':
      if (typeof v === 'string') {
        mtch = v.match(/^([+\-]?)(\d+(\.\d+)?|\.\d+)([eE][+\-]?\d+)?/);
        if (!mtch) {
          this[vr] = 0;
        } else {
          this[vr] = parseFloat(v, 10);
        }
      } else if (v === true) {
        this[vr] = 1;
      } else if (v === false || v === null) {
        this[vr] = 0;
      } else if (is_array(v) && v.length === 0) {
        this[vr] = 0;
      } else if (typeof v === 'object') {
        this[vr] = 1;
      }
      break;
    case 'string':
      if (v === null || v === false) {
        this[vr] = '';
      } else if (is_array(v)) {
        this[vr] = 'Array';
      } else if (typeof v === 'object') {
        this[vr] = 'Object';
      } else if (v === true) {
        this[vr] = '1';
      } else {
        this[vr] += '';
      } // numbers (and functions?)
      break;
    case 'array':
      if (v === null) {
        this[vr] = [];
      } else if (typeof v !== 'object') {
        this[vr] = [v];
      }
      break;
    case 'object':
      if (v === null) {
        this[vr] = {};
      } else if (is_array(v)) {
        for (i = 0, obj = {}; i < v.length; i++) {
          obj[i] = v;
        }
        this[vr] = obj;
      } else if (typeof v !== 'object') {
        this[vr] = {
          scalar: v
        };
      }
      break;
    case 'null':
      delete this[vr];
      break;
    }
    return true;
  } catch (e) {
    return false;
  }
}
{% endcodeblock %}

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

### Example 1
This code
{% codeblock lang:js example %}
foo = '5bar';
settype('foo', 'integer');
{% endcodeblock %}

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

### Example 2
This code
{% codeblock lang:js example %}
foo = true;
settype('foo', 'string');
{% endcodeblock %}

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


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