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46 lines (45 loc) · 1.68 KB
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function array_pop (inputArr) {
// http://kevin.vanzonneveld.net
// + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + input by: Brett Zamir (http://brett-zamir.me)
// + bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + bugfixed by: Brett Zamir (http://brett-zamir.me)
// + input by: Theriault
// % note 1: While IE (and other browsers) support iterating an object's
// % note 1: own properties in order, if one attempts to add back properties
// % note 1: in IE, they may end up in their former position due to their position
// % note 1: being retained. So use of this function with "associative arrays"
// % note 1: (objects) may lead to unexpected behavior in an IE environment if
// % note 1: you add back properties with the same keys that you removed
// * example 1: array_pop([0,1,2]);
// * returns 1: 2
// * example 2: data = {firstName: 'Kevin', surName: 'van Zonneveld'};
// * example 2: lastElem = array_pop(data);
// * returns 2: 'van Zonneveld'
// * results 2: data == {firstName: 'Kevin'}
var key = '',
lastKey = '';
if (inputArr.hasOwnProperty('length')) {
// Indexed
if (!inputArr.length) {
// Done popping, are we?
return null;
}
return inputArr.pop();
} else {
// Associative
for (key in inputArr) {
if (inputArr.hasOwnProperty(key)) {
lastKey = key;
}
}
if (lastKey) {
var tmp = inputArr[lastKey];
delete(inputArr[lastKey]);
return tmp;
} else {
return null;
}
}
}