I have a nested data structure containing objects and arrays. How can I extract the information, i.e. access a specific or multiple values (or keys)?  For example:  var data = {     code: 42,     items: [{         id: 1,         name: 'foo'...
What is the most efficient way to clone a JavaScript object? I've seen obj = eval(uneval(o)); being used, but that's non-standard and only supported by Firefox. I've done things like obj = JSON.parse(JSON.stringify(o)); but question the...
If I create an object like this:  var obj = {}; obj.prop1 = "Foo"; obj.prop2 = "Bar";   Will the resulting object always look like this?  { prop1 : "Foo", prop2 : "Bar" }   That is, will the properties be in the same...
Can someone suggest a way to compare the values of two dates greater than, less than, and not in the past using JavaScript? The values will be coming from text boxes....
A strict equality operator will tell you if two object types are equal. However, is there a way to tell if two objects are equal, much like the hash code value in Java?  Stack Overflow question Is there any kind of hashCode function in JavaScript?...
If I have a reference to an object:  var test = {};   that will potentially (but not immediately) have nested objects, something like:  {level1: {level2: {level3: "level3"}}};   What is the best way to check for the existence of property in...
If I have a JavaScript object such as:  var list = {   "you": 100,    "me": 75,    "foo": 116,    "bar": 15 };   Is there a way to sort the properties based on value? So that I end up with  list = {   "bar":...
I'm pulling items out of the DOM with jQuery and want to set a property on an object using the id of the DOM element.   Example  const obj = {}  jQuery(itemsFromDom).each(function() {   const element = jQuery(this)   const name = element.attr(&...
The behaviour can be seen in this little snippet (execute it as a global script):  var name = {}; name.FirstName = 'Tom'; alert(name.FirstName);   The alert yields undefined in Chrome but works in IE and Firefox. I also get a weird value wh...
If I have a JavaScript object such as:  var list = {   "you": 100,    "me": 75,    "foo": 116,    "bar": 15 };   Is there a way to sort the properties based on value? So that I end up with  list = {   "bar":...

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