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shuffle:
Edit: shuffle
Function:
shuffle
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Description:
Randomly shuffle the contents of an array.
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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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