JavaScript constructors

Developer
Sim Boon Long
Size
2,415 Kb
Views
14,168
  1. JavaScript constructors Previews
  2. JavaScript constructors HTML Codes
  3. JavaScript constructors CSS Codes
  4. JavaScript constructors JS Codes

How do I make an javascript constructors?

What is a javascript constructors? How do you make a javascript constructors? This script and codes were developed by Sim Boon Long on 19 December 2022, Monday.

JavaScript constructors Previews
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JavaScript constructors - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>JavaScript constructors</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <div class="container"> <p>Functional</p> <canvas id="canvas-functional"></canvas>
</div>
<div class="container"> <p>Prototypal Inheritance</p> <canvas id="canvas-prototypal"></canvas>
</div> <script src="js/index.js"></script>
</body>
</html>

JavaScript constructors - Script Codes CSS Codes

body{ background:#000; color:#fff; font-family:'Arial' sans-serif; font-size:10px;
}
.container { display:inline-block; margin-right:40px;
}
canvas{ border: white 1px solid;
}

JavaScript constructors - Script Codes JS Codes

// 2 different ways of writing constructors in JavaScript... does the same thing in this example.
//==================================
// Function Constructor
//==================================
(function(window, document, undefined) { "use strict"; var canvas = document.getElementById('canvas-functional'), ctx = canvas.getContext('2d'); canvas.width = 150; canvas.height = 150; var can_center_x = canvas.width / 2, can_center_y = canvas.height / 2, Hero = createCharacter(can_center_x, can_center_y, 10, 10); function createCharacter(x, y, w, h) { var Character = Character || {}; Character.x = x; Character.y = y; Character.w = w; Character.h = h; Character.moveRight = function() { this.x += 20; } Character.moveLeft = function() { this.x -= 20; } Character.moveDown = function() { this.y += 20; } Character.moveUp = function() { this.y -= 20; } Character.draw = function() { ctx.strokeRect(this.x, this.y, this.w, this.h); } return Character; } function draw() { ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.strokeRect(0, 0, canvas.width, canvas.height); Hero.draw(); } function initStyles() { ctx.fillStyle = "#000"; ctx.strokeStyle = "#FFF"; } function onDirectionalKeyDown(event) { switch (true) { // left case event.keyCode === 37: Hero.moveLeft(); break; // right case event.keyCode === 39: Hero.moveRight(); break; // up case event.keyCode === 38: Hero.moveUp(); break; // down case event.keyCode === 40: Hero.moveDown(); break; default: } } initStyles(); window.addEventListener('keydown', onDirectionalKeyDown); setInterval(draw, 1000 / 60);
})(this, this.document);
//==================================
// Prototypal Constructor
//==================================
(function(window, document, undefined) { "use strict"; var canvas = document.getElementById('canvas-prototypal'), ctx = canvas.getContext('2d'); canvas.width = 150; canvas.height = 150; var can_center_x = canvas.width / 2, can_center_y = canvas.height / 2, Hero = new Character(can_center_x, can_center_y, 10, 10); Character.prototype.moveRight = function() { this.x += 20; } Character.prototype.moveLeft = function() { this.x -= 20; } Character.prototype.moveDown = function() { this.y += 20; } Character.prototype.moveUp = function() { this.y -= 20; } Character.prototype.draw = function() { ctx.strokeRect(this.x, this.y, this.w, this.h); } function Character(x, y, w, h) { this.x = x; this.y = y; this.w = w; this.h = h; } function draw() { ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.strokeRect(0, 0, canvas.width, canvas.height); Hero.draw(); } function initStyles() { ctx.fillStyle = "#000"; ctx.strokeStyle = "#FFF"; } function onDirectionalKeyDown(event) { switch (true) { // left case event.keyCode === 37: Hero.moveLeft(); break; // right case event.keyCode === 39: Hero.moveRight(); break; // up case event.keyCode === 38: Hero.moveUp(); break; // down case event.keyCode === 40: Hero.moveDown(); break; default: } } initStyles(); window.addEventListener('keydown', onDirectionalKeyDown); setInterval(draw, 1000 / 60);
})(this, this.document);
JavaScript constructors - Script Codes
JavaScript constructors - Script Codes
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Developer Sim Boon Long
Username simboonlong
Uploaded December 19, 2022
Rating 3
Size 2,415 Kb
Views 14,168
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