Product of Numeric Values

Introduction

In this lab, we will be exploring how to calculate the product of two or more numbers/arrays using JavaScript. We will make use of the Array.prototype.reduce() method to multiply each value with an accumulator, which is initialized with a value of 1. By the end of this lab, you will have a better understanding of how to use the reduce method to solve problems involving multiplication of values.

Skills Graph

How to Calculate the Product of Numeric Values in JavaScript

To calculate the product of two or more numbers or arrays in JavaScript, follow these steps:

1. Open the Terminal/SSH and type node to start practicing coding.
2. Use the Array.prototype.reduce() method to multiply each value with an accumulator, which should be initialized with a value of 1.
3. Define a function called prod that takes any number of arguments using the spread operator (...). Within the function, apply the reduce() method to the spread array of arguments.
4. The function returns the result of the multiplication.

Here's an example of how to use the prod function:

const prod = (...arr) => [...arr].reduce((acc, val) => acc * val, 1);

prod(1, 2, 3, 4); // 24
prod(...[1, 2, 3, 4]); // 24

In the above example, prod(1, 2, 3, 4) and prod(...[1, 2, 3, 4]) both return 24.

Summary

Congratulations! You have completed the Product of Numeric Values lab. You can practice more labs in LabEx to improve your skills.