What is 'this.' keyword in JavaScript

-

In JavaScript 'this' is an object and a reference to the current object that is used to get and to set properties of the current object.

Take for instance within a function;

const func = function (name){
    this.name = name
}

func.name instance property name is set to that of the first argument;

const inst = new func('duke')

inst.name
// returns duke

You can as well extend func to set name using 'this';

func.prototype.set = function(name){
    this.name = name
}

Running the previous instance with this set method;

inst.set('John')
// returns John

Comments

Post a Comment

Popular posts from this blog

unused css rules tree shaking elimination nodejs

-
Unused css rules elimination process is a lot more like tree shaking done by JavaScript bundlers for instance if you're familiar with how webpack eliminates dead code as a result tree shaking generates a much smaller bundle with only essential code Purifycss is a nodejs npm open source package that eliminates unused css You can use purifycss to remove excess css from libraries such as bootstrap, materal design lite to name a few, Installation You can get "purify-css" npm package from the package manager by typing in your terminal; npm i purify-css To install globally add -g flag; npm i -g purify-css Basic example usage; You can use css purify global cli package as; Syntax; purifycss {css} {html} Important flags; -m minify output -o specify output file name For example; purifycss *.css *.html -o css.min.css Output containg minified css rules will get saved to css.min.css
Read more

FlappingBird JS13K Games

-
Image
FlappingBird is a Mobile side scroller game where the player controls a bird, attempting to fly between columns trees without hitting them Development of this game started out when i was attempting to draw perfect clouds programmatically on a canvas i later added a few more clouds (Something's missing) add moon, stars,  buildings and also add Gradients and for the games character i settled on a bird (using Sprite sheet obtained freely from opengameart) add more them and animated everything. FlappingBird is a single player arcade-style game in which the player controls the bird, which moves persistently to the right. The player is tasked with navigating the bird through pairs of trees that have equally sized gaps placed at random heights. the bird automatically gravitates and only ascends when the player taps the touchscreen or spacebar. Each successful pass through a pair of trees awards the player one point. Colliding with a tree or the ground ends the gamepl...
Read more

FlappingBird Postmortem (JS13K)

-
Image
FlappingBird was my Primary entry for JS13K Games competition 2020 It's about a bird flying in a forest of trees (Some of which are upside down) It started out as i was trying to draw some clouds for fun, then later i added every missing component to complete the sky First day. I planned making a game that should as well serve as a 404 page with a hidden game such that when a button is pressed It transitions into gameplay qualities were that it should be easy to play by everybody without need to master many rules Second day. There was a bunch of game ideas up my sleeves one of them was a game where a typical 404 page transitions into a green garden like mine sweeper version made up of a flowering mine field with smooth sweet sound effects Fourth day. We'll Since Mine sweeper is not a very common game there's nothing fun about it and not everyone knows how it's played. So i gave up on it and on this day i started working on backgrounds for flappingBird "the final...
Read more

JavaScript es6 template literals

-
Template literals are a new syntax to create strings in JavaScript Embedding expressions in a string is now possible using template literals thus there's a new way to embed expressions into strings effectively interpolating the values done using syntax ${expression} within a string for instance const text = 'Hello world' const string = `Say ${text}` // Say hello world. You're not only limited to that you can as well perform more advanced expressions and arithmetics as well const string = `${1 + 2}` // returns 3 strings that spawn more than one line are now possible with template literals initially the only way to create strings that spawn multiple lines was to break it up in parts the syntax below is now possible const text = ` loading.... processing...`
Read more

JavaScript intro to classes

-
Classes are objects 'functions which introduce inheritance parent child relationship in JavaScript it promotes code reusability which reduces the amount of code in a JavaScript application. JavaScript class decelerations start with keyword class proceeded by class name with a class body having a constructor along with methods for instance class human {     constructor(name) {          this.name = name;          this.gender = null;     }     great() {         return "Greetings " +         (this.gender == "male") ? "mr " : "mrs " + this.name     } } Child classes are created by adding the keyword extends followed by the parent class name and parent class methods can be called using the syntax super.+"method name"(parameters) class man extends human {   ...
Read more