The reason for the Math object is simple: “because Java does it”. Not the best of reasons, but here we are. I guess things made more sense back then, before Douglas Crockford started his campaign to suppress half the language*. Originally you were “allowed”, or meant, to do things like this: with (Math) { var … Read more
I feel slightly silly responding to a three-year-old question (and one that might be better asked on a different stackexchange), but I think there is still room for improved clarity in describing the difference between tracer bullets and prototypes. To begin, they are different things, with different purposes. But they also have similarities. I will … Read more
Well, Function.prototype.call references the “call” function, which is used to invoke functions with chosen this values; The subsequent .bind refers to the “bind” function on the Function prototype (remember: “call” is a function too), which returns a new function that will always have this set to the passed-in argument. The argument passed to “bind” is … Read more
Yes, it is possible, when your constructor function executes, the this value has already the [[Prototype]] internal property pointing to the ValidateFields.prototype object. Now, by looking at the your edit, the errArray variable is not available in the scope of the CreateErrorList method, since it is bound only to the scope of the constructor itself. … Read more
You can still attach a method on a class’ prototype; after-all, classes are just syntactic sugar over a “functional object”, which is the old way of using a function to construct objects. Since you want to use ES6, I’ll use an ES6 import. Minimal effort, using the prototype: import getColor from ‘path/to/module’; class Car { … Read more
You can simulate it like this: SpecialWidget.prototype = { load: function(args) { Widget.prototype.load.call(this, args); // specific code here } } Or you can create your own super property like this: SpecialWidget.prototype.parent = Widget.prototype; SpecialWidget.prototype = { load: function(args) { this.parent.load.call(this,args); // specific code here } }
Since push allows more than one element to be pushed, I use the arguments variable below to let the real push method have all arguments. This solution only affects the arr variable: arr.push = function () { //Do what you want here… return Array.prototype.push.apply(this, arguments); } This solution affects all arrays. I do not recommend … Read more
Assuming your Object comes from some JSON library that parses the server output to generate an Object, it will not in general have anything particular in its prototype ; and two objects generated for different server responses will not share a prototype chain (besides Object.prototype, of course 😉 ) If you control all the places … Read more
Please don’t implement any other version because it will eat all your memory in your app: var Player = function(){this.__gold = 0}; Player.prototype = { get gold(){ return this.__gold * 2; }, set gold(gold){ this.__gold = gold; }, }; var p = new Player(); p.gold = 2; alert(p.gold); // 4 If 10000 objects are instantiated: … Read more
Your syntax is wrong. Use this: function Renderer() { this.initialiseWebGL(); this.initialiseShader(); this.initialiseBuffer(); } Renderer.prototype.initialiseWebGL = function () { //Do stuff. }; Renderer.prototype.initialiseShader = function () { //Do Shader’s stuff }; Renderer.prototype.initialiseBuffer = function () { //Do Buffers }; After that you can create new object and use it by: var rendererInstance = new Renderer();