86 lines
2.1 KiB
JavaScript
86 lines
2.1 KiB
JavaScript
/*
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* Helma License Notice
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*
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* The contents of this file are subject to the Helma License
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* Version 2.0 (the "License"). You may not use this file except in
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* compliance with the License. A copy of the License is available at
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* http://adele.helma.org/download/helma/license.txt
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*
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* Copyright 1998-2006 Helma Software. All Rights Reserved.
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*
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* $RCSfile: Array.js,v $
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* $Author$
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* $Revision$
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* $Date$
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*/
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/**
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* @fileoverview Adds useful methods to the JavaScript Array type.
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* <br /><br />
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* To use this optional module, its repository needs to be added to the
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* application, for example by calling app.addRepository('modules/core/Array.js')
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*/
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/**
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* Check if this array contains a specific value.
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* @external
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* @memberof {Array}
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* @param {Object} val the value to check
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* @return {boolean} true if the value is contained
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*/
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Array.prototype.contains = function(val) {
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return this.indexOf(val) > -1;
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};
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/**
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* Retrieve the union set of a bunch of arrays
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* @external
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* @memberof {Array}
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* @param {Array} array1,... the arrays to unify
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* @return {Array} the union set
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*/
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Array.union = function() {
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var result = [];
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var map = {};
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for (var i=0; i<arguments.length; i+=1) {
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for (var n in arguments[i]) {
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var item = arguments[i][n];
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if (!map[item]) {
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result.push(item);
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map[item] = true;
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}
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}
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}
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return result;
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};
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/**
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* Retrieve the intersection set of a bunch of arrays
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* @external
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* @memberof {Array}
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* @param {Array} array1,... the arrays to intersect
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* @return {Array} the intersection set
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*/
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Array.intersection = function() {
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var all = Array.union.apply(this, arguments);
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var result = [];
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for (var n in all) {
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var chksum = 0;
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var item = all[n];
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for (var i=0; i<arguments.length; i+=1) {
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if (arguments[i].contains(item))
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chksum += 1;
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else
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break;
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}
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if (chksum == arguments.length)
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result.push(item);
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}
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return result;
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};
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// prevent any newly added properties from being enumerated
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for (var i in Array)
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Array.dontEnum(i);
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for (var i in Array.prototype)
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Array.prototype.dontEnum(i);
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