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JOHN SWANA

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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 {   ...
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JavaScript canvas introduction

Introduction Probably next monday I will post a how to make a snake game clone in a few lines of JavaScript code post don't miss it out subscribe to my email newsletter! What is a canvas I'm sure you've heard of the term somewhere. canvas through their "2d" context allow drawing 2d graphics using a simple JavaScript api You can use a canvas to draw text , lines simple shapes, and images canvas can also be used as a renderer for JavaScript built html5 games "that's were we're going" Example on canvas it draws a rectangle on a canvas context black color by default <html> <canvas id="canvas"></canvas> <script type="text/javascript">         var context = canvas.getContext("2d") // stroke a 100px square at 0, 0 context.rect(0, 0, 100, 100) context. stroke () </script> </html> Save and open it in your browser you should see a square on the top right corner of your bro...
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JavaScript var const and let

Signification and let are new JavaScript methods of declaring a variables on modern browser's you don't need to enable strict mode to make use of const, and let What's the difference between var , let and const Immutability when you declare a variable using const its value is immutable ie you can't simply reassign the variable with another value neither can you declare const variables as const variable, another; because it's pointless afterall scope of this let variable decelerations are block scoped therefore if used in an if statement or in a function its value is scoped within that block
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JavaScript math methods

JavaScript comprehensive list of all JavaScript Math methods Math.round () {type} method {parameter} {Number} {description} It returns a given number rounded off to the nearest integer. ie Math.round(0.6251) // returns 1 or Math.round(1.7252) // returns 2 Math . pow () {type} method {parameter} {Number}, {Number} {description} It returns a given number raised to the power the exponent. ie Math.pow(2, 5) // returns 32 or Math.pow(7, 2) // returns 49 Math.sqrt () {type} method {parameter} {Number} {description} It returns the square root of a given integer. ie Math.sqrt(25) // returns 5 or Math.sqrt(64) // returns 8 Math.abs () {type} method {parameter} {Number} {description} It returns absolute positive value of a given number ie Math.abs(-10) // returns 10 or Math.abs(52) // returns 52 Math.ceil () {type} method {parameter} {Number} {description} It returns a smaller number which is greater or equal to the given integer. ie Math.ceil(9.87) // returns 10 or...
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How to target all elements of a given class name in JavaScript

JavaScript getByClassName only targets one element by default Workarounds  "loops " Loops can mess up your code I personally don't like them. To target all elements you will have to iterate through all of them for each element you will have to add a event listener Example For instance the are 3 links of a same class and you want to add event listeners on all of them .... .... .... // JavaScript const links = document.getByClassName("links") for(var i = 0; i < links.length; i++) links[i].addEventListener('click', event => console.log(event.target.get attribute('class')))
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