The this keyword refers to the object the function belongs to, or the window object if the function belongs to no object. It’s used in OOP code, to refer to the class/object the function belongs to For example: function foo() { this.value=”Hello, world”; this.bar = function() { alert(this.value); } } var inst = new foo(); … Read more
this is the DOM object, whereas $(this) is the jQuery wrapper around same. When using this, you can call DOM methods on it, but not jQuery methods. When using $(this), you can call jQuery methods on it, but not DOM methods.
Arrow functions capture the this value of the enclosing context function Person(){ this.age = 0; setInterval(() => { this.age++; // |this| properly refers to the person object }, 1000); } var p = new Person(); So, to directly answer your question, this inside your arrow function would have the same value as it did right … Read more
You can use jQuery.proxy() with anonymous function, just a little awkward that ‘context’ is the second parameter. $(“#button”).click($.proxy(function () { //use original ‘this’ },this));
Source code is here. exports/require are not keywords, but global variables. Your main script is wrapped before start in a function which has all the globals like require, process etc in its context. Note that while module.js itself is using require(), that’s a different require function, and it is defined in the file called “node.js” … Read more
Yes, it is not required and is usually omitted. It might be required for accessing variables after they have been overridden in the scope though: Person::Person() { int age; this->age = 1; } Also, this: Person::Person(int _age) { age = _age; } It is pretty bad style; if you need an initializer with the same … Read more
this.intervalID = setInterval(this.retrieve_rate.bind(this), this.INTERVAL);
but Java is clever enough to know what is happening if I change the statement in the constructor to bar = bar; FALSE! It compiles but it doesn’t do what you think it does! As to when to use it, a lot of it is personal preference. I like to use this in my public … Read more
First of all, let me correct you – self is not a method. Moving further: Technically both self and this are used for the same thing. They are used to access the variable associated with the current instance. Only difference is, you have to include self explicitly as first parameter to an instance method in … Read more
Both of those examples use an arrow function () => { }, which binds this to a context different from the Vue instance. As per the documentation: Don’t use arrow functions on an instance property or callback (e.g. vm.$watch(‘a’, newVal => this.myMethod())). As arrow functions are bound to the parent context, this will not be … Read more