I have an object, x. I'd like to copy it as object y, such that changes to y do not modify x. I realized that copying objects derived from built-in JavaScript objects will result in extra, unwanted properties. This isn't a problem, since I&...
I need to be able to merge two (very simple) JavaScript objects at runtime.  For example I'd like to:  var obj1 = { food: 'pizza', car: 'ford' } var obj2 = { animal: 'dog' }  obj1.merge(obj2);  //obj1 now has three prope...
If I have a JavaScript object, say  var myObject = new Object(); myObject["firstname"] = "Gareth"; myObject["lastname"] = "Simpson"; myObject["age"] = 21;   is there a built-in or accepted best practice way t...
This figure again shows that every object has a prototype. Constructor   function Foo also has its own __proto__ which is Function.prototype,   and which in turn also references via its __proto__ property again to   the Object.prototype. Thus, r...
What is the most concise and efficient way to find out if a JavaScript array contains a value?  This is the only way I know to do it:  function contains(a, obj) {     for (var i = 0; i < a.length; i++) {         if (a[i] === obj) {             r...
I have built a large application using JavaScript prototype and inheritance. But I am having a hard time organizing my code. For example I have a class carousel which has many functions like this:  Carousel.prototype.next = function () {...} Carous...
The following two different code snippets seem equivalent to me:  var myArray = Array(); myArray['A'] = "Athens"; myArray['B'] = "Berlin";   and  var myObject = {'A': 'Athens', 'B':'Berlin...
How do I display the content of a JavaScript object in a string format like when we alert a variable?  The same formatted way I want to display an object....
I want to remove the bad property from every object in the array. Is there a better way to do it than using a for loop and deleting it from every object?  var array = [{"bad": "something", "good":"something"},{"b...

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