JavaScript Fundamentals Hands-on

Introduction

In this lab, we will explore and practice various JavaScript programming concepts such as array manipulation, object creation, and function composition. The purpose of this lab is to help you develop your skills in JavaScript programming by providing hands-on exercises that cover fundamental concepts. By the end of this lab, you will have a better understanding of how to use JavaScript to solve common programming problems.

Skills Graph

Code Practice

To start practicing coding, open the Terminal/SSH and type node. Then, you can use the generateItems function to generate an array with a specific number of items.

• Call generateItems with the desired number of items and a function that will be used to generate the items.
• generateItems uses Array.from() to create an empty array of the specified length, and calls the provided function with the index of each newly created element.
• The provided function takes one argument - the index of each element.

const generateItems = (n, fn) => Array.from({ length: n }, (_, i) => fn(i));

Here's an example of using generateItems to generate an array of 10 random numbers:

generateItems(10, Math.random);
// [0.21, 0.08, 0.40, 0.96, 0.96, 0.24, 0.19, 0.96, 0.42, 0.70]

Summary

Congratulations! You have completed the Generate Items lab. You can practice more labs in LabEx to improve your skills.