The primitive types (number, string, etc.) are passed by value, but objects are unknown, because they can be both passed-by-value (in case we consider that a variable holding an object is in fact a reference to the object) and passed-by-reference (...
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I was trying to understand passing of variables and objects in JavaScript, and came across this page.  It is explained that JavaScript objects are passed by value, but the value itself is a reference. Though I understood what was happening in the exa...
We all know JS has objects and a group of primitives.  Let's examine the following assignments.  a = 'foo'; b = a; c = 'foo' a === b; //true a = b = c = undefined;   The way I visualize the variable assignment process in JS for ye...
I have a problem passing an Array of Arrays by value. I use slice() to pass a copy of the array, but the original is still modified. Here a small sample:  var test = [[1,2],[3,4]];  function addElement(data) {     $.each(data,function(v,val) {...
I found that there are these two ways that a variable property value can be updated on a function call  Example 1:    function bar( arg ) {   return arg + 1; }  var foo = {   num: 1 };  foo.num = bar( foo.num ); console.log( foo.num );     Example 2:...
I'd like to assign part of the DOM tree to global variable, so that there isn't reference with my variable and DOM tree any more. The part of the DOM tree should be copied to global variable and when I make changes to DOM tree it shouldn'...
I can't figure out how to pass an argument by value in JavaScript to onClick-function. I have been trying with closure functions but it doesn't seem to work!! aah  ...  for(var i=0; i<=15; i++){     blockNr++;     meal = getMealByCategory(...
As someone used to python and C++, having an = copy objects by reference rather than value is not intuitive at all. Not just that, but there seems to be no direct way of copying objects to begin with. JSON.parse(JSON.stringify) is the closest option...

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