JavaScript: Draw a rectangular shape

Last update on May 30 2022 10:01:43 (UTC/GMT +8 hours)

JavaScript Drawing: Exercise-1 with Solution

Write a JavaScript program to draw the following rectangular shape.

Sample output:

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Draw a rectangular shape</title>
</head>
<body onload="draw();">
<canvas id="canvas" width="150" height="150"></canvas>
</body>
</html>

JavaScript Code:

function draw() {
  var canvas = document.getElementById('canvas');
  if (canvas.getContext) {
    var context = canvas.getContext('2d');

    context.fillRect(20,20,100,100);
    context.clearRect(40,40,60,60);
    context.strokeRect(45,45,50,50);
  }
}

Live Demo:

See the Pen javascript-drawing-exercise-1 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04