I read here (Douglas Crockford) using prototype operator to add methods to Javascript classes saves also memory.  Then I read in this John Resig's article "Instantiating a function with a bunch of prototype properties is very, very, fast...
I'd like to understand when it is appropriate to use prototype methods in js.  Should they always be used? Or are there cases where using them is not preferred and/or incurs a performance penalty?    In searching around this site on common method...
I have the following function in a class:  MyClass.prototype.myFunction = function(item, args)  {            console.log(this); }   This function is called from an external library that I don't have access to change.  When it's called, the co...
Could anyone tell "this" keyword in js ..  I looked examples . There is a point that I can't understand.      A.B=function()     {       this.x(5); // this refers to prototype of A.B     }      A.B.prototype= {      x:function(p)     { th...
I`ve made a prototype for "between" function.  Why I can't use it directly on number? It is Number object whatsoever!  var a = 21; 21.between("( 16 20 ]"); // this is wrong and not working //alert ( typeof 21 ) is number a.between...
I am using NodeJS together with MongoDB and have some issues with passing the mongoDB object to all my prototype functions. I don't understand how to pass this object between these prototypes. Maybe someone could point me in the right direction?...
I have this prototype function defined in a common.js   goog.ui.tree.TreeControl.prototype.enterDocument = function() {     goog.ui.tree.TreeControl.superClass_.enterDocument.call(this);     var a = this.getElement();     a.setAttribute("hideFocu...
As per my understanding (though new to Javascript), Object instances inherit properties and methods of their prototypes. In the following, I explicitly set the Title object instance's prototype to Foo() and therefore Title should inherit Foo'...

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