analytics/webcontent/bi/js/gemini/app/util/UnderscoreExt.js

'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2017, 2018
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */
define(['underscore'], function (_) {
	/**
  * Get the difference between 2 array of obejcts based on the search key.
  * @param aObject1 array of object 1
  * @param aObject2 array of object 2
  * @param searchkey used to identify entries
  * @return an array of object from aObject1 but doesn't present the same value in aObject2.
  * e.g.
  * aObject1 = [
  *			{'displayValue': 'a', 'useValue': 'a'},
  *			{'displayValue': 'b', 'useValue': 'b'},
  *			{'displayValue': 'c', 'useValue': 'c'},
  *			{'displayValue': 'd', 'useValue': 'd'}
  *	];
  *	aObject2 = [
  *			{'displayValue': 'a', 'useValue': 'a'},
  *			{'displayValue': 'b', 'useValue': 'b'},
  *			{'displayValue': 'c', 'useValue': 'c'}
  *	]
  *
  *  The result will be [{'displayValue': 'd', 'useValue': 'd'}]
  */
	_.objDifference = function (aObject1, aObject2, searchkey) {
		return aObject1.filter(function (current1) {
			return aObject2.filter(function (current2) {
				return current1[searchkey] === current2[searchkey];
			}).length === 0;
		});
	};

	/* implementation of debounce that calls the provided function a maximum of once per 'time' ms
  * 'fn' will be called immediately and then after 'time' of not getting called.
  *
  * if wrappedFn is called once, fn is called once immediately.
  * if wrappedFn is called more once in rapid succession (each call within 'time' ms of the last, fn is called twice:
  *  once immediately.
  *  a second time 'time' ms after the last invocation.
  *
  * this differs from the standard underscore version in the fact that fn is called first.
  */
	_.doubleDebounce = function (fn, time) {
		var timeout = null;
		var lastCall = 0;
		var later = function later(args) {
			timeout = null;
			lastCall = Date.now();
			fn(args);
		};
		var wrappedFn = function wrappedFn(args) {
			// more than 'time' since last call and nothing scheduled, so just call fn
			if (Date.now() - lastCall > time && !timeout) {
				lastCall = Date.now();
				fn(args);
			} else {
				// less than 'time' since last call or 'later' is already scheduled.
				// push the callback to the future.
				clearTimeout(timeout);
				timeout = setTimeout(later, time, args);
			}
		};
		wrappedFn.cancel = function () {
			return clearTimeout(timeout);
		};
		return wrappedFn;
	};
});
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