Use PHP functions in JavaScript

JavaScript settype

Set the type of the variable

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function settype (vr, type) {
    // Set the type of the variable  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/settype    // +   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;
    }
}
external links: original PHP docs | raw js source

Examples

» Example 1

Running

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2
foo = '5bar';
settype('foo', 'integer');

Should result in

1
foo === 5

» Example 2

Running

1
2
foo = true;
settype('foo', 'string');

Should result in

1
foo === '1'

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

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Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.


Authors

Thanks to the following developers, you get to have settype goodness in JavaScript.

Comments

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More functions

In this category

doubleval
empty
floatval
get_defined_vars
get_resource_type
gettype
import_request_variables
intval
is_array
is_binary
is_bool
is_buffer
is_callable
is_double
is_float
is_int
is_integer
is_long
is_null
is_numeric
is_object
is_real
is_resource
is_scalar
is_string
is_unicode
isset
print_r
serialize
» settype
strval
unserialize
var_dump
var_export

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