Skip to main content

Check if String contains Whitespace in JavaScript

In this article, we will explore different methods to check if a string in JavaScript contains spaces.

Using the RegExp.test() Method

One way to check if a string contains spaces is to use the test() method of the RegExp object. The test() method will return true if the string contains at least one whitespace character and false otherwise.

function containsWhitespace(str) {  return /\s/.test(str);}console.log(containsWhitespace('  ')); // 👉️ trueconsole.log(containsWhitespace('free to reads com')); // 👉️ trueconsole.log(containsWhitespace('')); // 👉️ falseconsole.log(containsWhitespace('test')); // 👉️ false

The regular expression /\s/ checks for all types of whitespace characters, including spaces, tabs, and newline characters. The \s character is used to match spaces, tabs, and newlines.

function containsWhitespace(str) {  return /\s/.test(str);}console.log(containsWhitespace('hello\tworld')); // 👉️ trueconsole.log(containsWhitespace('hello\nworld')); // 👉️ true

Using the String.includes() Method

Another way to check if a string contains spaces is to use the includes() method of the String object. The includes() method will return true if the string contains whitespace and false otherwise.

function containsWhitespace(str) {  return str.includes(' ');}console.log(containsWhitespace('  ')); // 👉️ trueconsole.log(containsWhitespace('free to reads com')); // 👉️ trueconsole.log(containsWhitespace('')); // 👉️ falseconsole.log(containsWhitespace('test')); // 👉️ false

Note that the includes() method only checks for spaces, and it would return false if your string contains only tabs or newline characters.

function containsWhitespace(str) {  return str.includes(' ');}console.log(containsWhitespace('free to reads')); // 👉️ trueconsole.log(containsWhitespace('hello\tworld')); // 👉️ falseconsole.log(containsWhitespace('hello\nworld')); // 👉️ false

Using the String.match() Method

Another way to check if a string contains whitespace is to use the match() method of the String object. The match() method will return true if the string contains whitespace and false otherwise.

function containsWhitespace(str) {  return str.match(/\s/) !== null;}console.log(containsWhitespace('free to reads')); // 👉️ trueconsole.log(containsWhitespace('hello\tworld')); // 👉️ trueconsole.log(containsWhitespace('hello\nworld')); // 👉️ true

In this method, we use the match() method to check if the string contains whitespace by matching it with the regular expression /\s/. If a match is found, the method returns an array containing the match and we check if the array is not equal to null to determine if the string contains whitespace.

This method provides an alternative way to check for whitespace, using the same regular expressions that we used in the RegExp.test() method, but in this case we are using the match() method to check if it matches whitespaces, if it matches the method return an array containing the match, if not the method returns null

Conclusion on “Check if String contains Whitespace“

In this article, we have discussed different ways to check if a string in JavaScript contains spaces. The RegExp.test() method checks for all types of whitespace characters, the String.includes() method checks for only spaces, and the String.match() method checks for whitespace using regular expressions, and returns an array if match is found. Depending on your use case, you can choose the method that best suits your needs.

Labels:

Comments

Post a Comment

Popular posts from this blog

Top 10 Web Hosting Companies in 2024

 As the world of internet grows, the need for high-quality, reliable web hosting has never been more important. In this blog post, we'll delve into the top 10 web hosting companies in 2024, examining their features, pricing, and how they stack up against each other. Exploring The Importance of Reliable Web Hosting The lifeblood of the digital universe is web hosting. It's the sturdy anchor keeping every website afloat in the sea of the internet. Reliable web hosting is your ally in carving out your own piece of the online world, ensuring your site remains accessible, loading with speed, and guarding your precious data securely. It's like owning prime real estate in the metropolis of the internet, where your digital presence is steadfast, standing tall among the rest. This, in a nutshell, is the essential role of a trustworthy web hosting service. It's not just about the space; it's about the quality, reliability, and safety of that space. The Rise of Green Hostin...
Post a Comment
Read more

Unexpected reserved word 'await' error in JavaScript

The “ unexpected reserved word await ” error is a common problem that can occur when using the ‘await’ keyword in JavaScript. This error occurs when the ‘await’ keyword is used inside of a function that is not marked as ‘async’. In this post, we’ll take a look at two examples of how this error can occur and how to fix it. Example 1: Using await inside a function that is not marked as async One of the most common causes of the “ unexpected reserved word await ” error is trying to use the ‘await’ keyword inside a function that is not marked as ‘async’. Here’s an example of how this error can occur: function getString() { //not marked async // error: unexpected reserved word 'await' const str = await Promise.resolve('hello'); return str;} In this example, we are trying to use the ‘await’ keyword inside the ‘getString’ function to wait for a promise to resolve. However,...
Post a Comment
Read more

Cannot find module 'commander' error in Node.js

If you’re seeing the error Cannot find module 'commander' while working with Node.js, it means that the commander module is not installed in your project. This module is a popular command-line interface (CLI) module that helps you build CLIs for your Node.js applications. Installing the Commander Package To fix the error, you’ll need to install the commander package in your project. Here’s how you can do that: Open your terminal in your project’s root directory (where your package.json file is located). Run the following command: npm install commander This will add the commander package to the dependencies of your project. Restarting Your IDE and Development Server If installing the commander package doesn’t solve the error, try restarting your Integrated Development Environment (IDE) and your development server. Sometimes, a simple restart can fix issues like these. [Fixed]: ImportError: cannot import name ‘json’ from ‘itsdangerous...
Post a Comment
Read more