Overview

Introduction

Welcome to the Working with Loop Statements Practice Lab. In this module, you will be provided with the instructions and devices needed to develop your hands-on skills.

Exam Objectives

The following exam objective is covered in this lab:

  • 3.3 Complete and debug loops

Lab Duration

It will take approximately 20 minutes to complete this lab.

Exercise 1 - Working with Loops

In computer programming, you can write code to execute a set of instructions, operations, or statements for several times until a specific condition is met. This process is known as iteration. You can implement the iteration process in scripts with the help of loops. A loop repeatedly runs through the set of instructions and stops execution on fulfilling the condition specified. The following types of loops are available in JavaScript:

  • for loop - You can use this loop if you want to repeat the execution of a code block multiple times.
  • for/in loop - This loop is a type of for loop. It iterates through the properties of a declared object.
  • while loop - This loop executes the set of statements while the specified condition returns a true value. The moment the specified condition returns a false value, the while loop will not perform the iteration. Thus, the while loop checks the condition and then performs the iteration.
  • do/while loop - This loop is a type of while loop. It first executes the code block and then checks if the condition is true. The do/while loop then repeats the execution until the condition returns a true value.

In this exercise, you will learn to use all these types of loops in the To Do List page. You will perform the following tasks:

  • Task 1 - You will download the Visual Studio Code workspace (ToDoList) from the Intranet and open the HTML page named ToDoList.html in the ToDoList workspace.
  • Task 2 - You will write JavaScript code to use for and for/in loops in the To Do List page.
  • Task 3 - You will write JavaScript code to use while loop in the To Do List page.
  • Task 4 - You will write JavaScript code to use a do/while loop in the To Do List page.

Learning Outcomes

After completing this exercise, you will be able to:

  • Use loops in JavaScript

Comprehensive Learning

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