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JavaScript drawing - Exercises, Practice, Solution

JavaScript drawing [6 exercises with solution]

[An editor is available at the bottom of the page to write and execute the scripts.]

1. Write a JavaScript program to draw the following rectangular shape. Go to the editor
Expected Output :
rectagular shape
Click me to see the solution

2. Write a JavaScript program to draw a circle. Go to the editor
Expected Output :
draw a circle
Click me to see the solution

3. Write a JavaScript program to draw two intersecting rectangles, one of which has alpha transparency. Go to the editor
Expected Output :
intersecting rectangles
Click me to see the solution

4. Write a JavaScript program to draw the following right-angled triangle. Go to the editor
Expected Output :
right angled triangle
Click me to see the solution

5. Write a JavaScript program to draw the following diagram [use moveto() function]. Go to the editor
Expected Output :
draw fun
Click me to see the solution

6. Write a JavaScript program to draw the following diagram [diagonal, white to black circles]. Go to the editor
Expected Output :
diagonal, white to black circles
Click me to see the solution

More to Come !

* To run the code mouse over on Result panel and click on 'RERUN' button.*

Live Demo:

See the Pen javascript-common-editor by w3resource (@w3resource) on CodePen.


Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.



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