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Update lib_polyfill.js Array.prototype.filter #2

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Update lib_polyfill.js Array.prototype.filter #2

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49 changes: 10 additions & 39 deletions core/lib_polyfill.js
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Original file line number Diff line number Diff line change
Expand Up @@ -133,44 +133,15 @@
/************************* ARRAY *************************/


if (!Array.prototype.filter) {
Array.prototype.filter = function(func, thisArg) {
'use strict';
if (!((typeof func === 'Function' || typeof func === 'function') && this))
throw new TypeError();

var len = this.length >>> 0,
res = new Array(len), // preallocate array
t = this,
c = 0,
i = -1;

var kValue;
if (thisArg === undefined) {
while (++i !== len) {
// checks to see if the key was set
if (i in this) {
kValue = t[i]; // in case t is changed in callback
if (func(t[i], i, t)) {
res[c++] = kValue;
}
}
}
} else {
while (++i !== len) {
// checks to see if the key was set
if (i in this) {
kValue = t[i];
if (func.call(thisArg, t[i], i, t)) {
res[c++] = kValue;
}
}
}
}

res.length = c; // shrink down array to proper size
return res;
};
Array.prototype.filter = function(fn) {
var a = [];
for (var i = 0; i < this.length; i++) {
var n = fn(this[i]);
if (n) {
a.push(this[i]);
}
}
return a;
}


Expand Down Expand Up @@ -461,4 +432,4 @@
}());
}

</script>
</script>