Sometimes, we want to check if a text is all white space characters in JavaScript.
In this article, we’ll look at how to check if a text is all white space characters in JavaScript.
How to check if a text is all white space characters in JavaScript?
To check if a text is all white space characters in JavaScript, we use the replace method.
For instance, we write
const trimmedUserText = userText.replace(/^\s+/, "").replace(/\s+$/, "");
if (trimmedUserText === "") {
// ...
} else {
// ...
}
to call replace to replace all whitespaces at the start of the string with empty strings with
userText.replace(/^\s+/, "")
Then we call replace again with /\s+$/ and '' to replace the rest of the whitespaces with empty strings.
And then a new string is returned with the replacements.
If trimmedUserText is an empty string, that means userText is all whitespace.
Conclusion
To check if a text is all white space characters in JavaScript, we use the replace method.
