Mastering Null Value Checks in JavaScript

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.

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL javascript(("`JavaScript`")) -.-> javascript/BasicConceptsGroup(["`Basic Concepts`"]) javascript/BasicConceptsGroup -.-> javascript/variables("`Variables`") javascript/BasicConceptsGroup -.-> javascript/data_types("`Data Types`") javascript/BasicConceptsGroup -.-> javascript/comp_ops("`Comparison Operators`") subgraph Lab Skills javascript/variables -.-> lab-28429{{"`Value Is Null`"}} javascript/data_types -.-> lab-28429{{"`Value Is Null`"}} javascript/comp_ops -.-> lab-28429{{"`Value Is Null`"}} end

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

Congratulations! You have completed the Value Is Null lab. You can practice more labs in LabEx to improve your skills.

Value Is Null

Introduction

Skills Graph

Checking if a Value is Null

Summary

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