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Value Is Null

Beginner

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Introduction

In this lab, we will delve into the concept of checking if a specified value is null using JavaScript. We will explore the use of the strict equality operator to determine if the value of a given variable is equal to null. By the end of this lab, you will have a better understanding of how to write a function that checks for null values in JavaScript.

This is a Guided Lab, which provides step-by-step instructions to help you learn and practice. Follow the instructions carefully to complete each step and gain hands-on experience. Historical data shows that this is a beginner level lab with a 97% completion rate. It has received a 98% positive review rate from learners.

Checking if a Value is Null

To check if a value is null in JavaScript, use the strict equality operator (===). Here's an example code snippet that defines a function called isNull which returns true if the given value is null and false otherwise.

const isNull = (val) => val === null;

To test this function, you can call it with the value you want to check as its argument. For example, isNull(null) will return true.

Summary

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