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44 lines
1.4 KiB
44 lines
1.4 KiB
// Warn if overriding existing method
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if(Array.prototype.equals)
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console.warn("Overriding existing Array.prototype.equals. Possible causes: New API defines the method, there's a framework conflict or you've got double inclusions in your code.");
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// attach the .equals method to Array's prototype to call it on any array
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Array.prototype.equals = function (array) {
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// if the other array is a falsy value, return
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if (!array)
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return false;
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// compare lengths - can save a lot of time
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if (this.length != array.length)
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return false;
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for (var i = 0, l=this.length; i < l; i++) {
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// Check if we have nested arrays
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if (this[i] instanceof Array && array[i] instanceof Array) {
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// recurse into the nested arrays
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if (!this[i].equals(array[i]))
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return false;
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}
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else if (this[i] != array[i]) {
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// Warning - two different object instances will never be equal: {x:20} != {x:20}
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return false;
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}
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}
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return true;
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}
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// Hide method from for-in loops
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Object.defineProperty(Array.prototype, "equals", {enumerable: false});
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Array.prototype.matchItems = function (array) {
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// if the other array is a falsy value, return
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if (!array)
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return [];
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return this.filter(item => array.includes(item));
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}
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// Hide method from for-in loops
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Object.defineProperty(Array.prototype, "matchItems", {enumerable: false});
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