I've been saving all the data received from services direct to local variable, controller, or scope. What I suppose would be considered a shallow copy, is that correct?  Example:  DataService.callFunction() .then(function(response) {   $scope.exa...
I have some library code that is cycling endlessly on me.  I'm not clear on how to best perform cycle detection and avoidance in javascript. i.e. there's no programmatic way of inspecting whether an object came from a "this" reference...
How can I copy every element of an array (where the elements are objects), into another array, so that they are totally independent? I don't want changing an element in one array to affect the other....
According to the docs for Array.prototype.slice() in JavaScript, the slice() method returns a shallow copy of a portion of an array into a new array. It is my understanding that a shallow copy will only copy top level elements in an array and will no...
Introduction  I have a Class Persons that contains an array of Person and functions :  function Persons() {   this.mItems = []; // Array of Objects Person }  Persons.prototype = {   calculateScores : function() {     // Do some stuff   } }   The Clas...
I'd hope to find an example code to do a deep copying of objects in ECMAScript5.  The copying should be able to clone   Nested objects  Nested arrays Nested objects in arrays (clone each array item individually)   Note: jQuery.extend() does not s...
At first I thought arr.slice(0) was doing a deep unreferenced copy, but it is actually doing just a shallow unreferenced copy, so if the array contains nested arrays, they are still referenced:  var a = [1,2] var b = [3,4] var c = [a,b] var d = c.sli...
Let's I have next javascript object. Now I want clone it but without some fields. For example I want cloned object without field "lastName" and "cars.age" Input  {    "firstName":"Fred",    "lastName":"...
The following in a Javascript console:  var a = {'foo': []}; var b = {};  for (var key in a) {    b[key] = a[key]; }  a['foo'].push(1);  console.log(b);   Yields:  Object foo=[1]  I want to make a copy by value in b of each array for...
curious... how would you write this Ruby in JS?  Array.new(3, Array.new(3, 0))   which returns  [[0, 0, 0], [0, 0, 0], [0, 0, 0]]   i've tried a variety of things but they all seem messy.  i suppose some things just can't be as clean as Ruby,...

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