Edit: shuffle

Function:	shuffle View shuffle Edit shuffle Edit code Edit tests Edit benchmark View latest code Edit latest code Benchmark shuffle Comment on shuffle Comment on the latest code View revisions View versions View contributors View dependencies View comments View links Download production code Download development code View the PHP docs View phpjs.org View phpjs.org raw code
Description:	Randomly shuffle the contents of an array.

Edit function

Code:	function shuffle (inputArr) { // http://jsphp.co/jsphp/fn/view/shuffle // + original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com) // + revised by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + revised by: Brett Zamir (http://brett-zamir.me) // + improved by: Brett Zamir (http://brett-zamir.me) // % note 1: This function deviates from PHP in returning a copy of the array instead // % note 1: of acting by reference and returning true; this was necessary because // % note 1: IE does not allow deleting and re-adding of properties without caching // % note 1: of property position; you can set the ini of "phpjs.strictForIn" to true to // % note 1: get the PHP behavior, but use this only if you are in an environment // % note 1: such as Firefox extensions where for-in iteration order is fixed and true // % note 1: property deletion is supported. Note that we intend to implement the PHP // % note 1: behavior by default if IE ever does allow it; only gives shallow copy since // % note 1: is by reference in PHP anyways // * example 1: ini_set('phpjs.strictForIn', true); // * example 1: shuffle({5:'a', 2:'3', 3:'c', 4:5, 'q':5}); // * returns 1: {5:'a', 4:5, 'q':5, 3:'c', 2:'3'} // * example 2: ini_set('phpjs.strictForIn', true); // * example 2: var data = {5:'a', 2:'3', 3:'c', 4:5, 'q':5}; // * example 2: shuffle(data); // * results 2: {5:'a', 'q':5, 3:'c', 2:'3', 4:5} // * returns 2: true var valArr = [], k = '', i = 0, strictForIn = false, populateArr = []; for (k in inputArr) { // Get key and value arrays if (inputArr.hasOwnProperty(k)) { valArr.push(inputArr[k]); if (strictForIn) { delete inputArr[k]; } } } valArr.sort(function () { return 0.5 - Math.random(); }); // BEGIN REDUNDANT this.php_js = this.php_js || {}; this.php_js.ini = this.php_js.ini || {}; // END REDUNDANT strictForIn = this.php_js.ini['phpjs.strictForIn'] && this.php_js.ini['phpjs.strictForIn'].local_value && this.php_js.ini['phpjs.strictForIn'].local_value !== 'off'; populateArr = strictForIn ? inputArr : populateArr; for (i = 0; i < valArr.length; i++) { // Repopulate the old array populateArr[i] = valArr[i]; } return strictForIn || populateArr; }
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