JavaScript Check if String Contains Spaces

JavaScript Check if String Contains Spaces | The string Object in JavaScript is used to represent and manipulate a series of characters. They are mainly used to hold data which is in text form. This article focuses on how one can check whether a string contains spaces in it.

JavaScript Check if String Contains Spaces Using Regular Expressions

The JavaScript regular expression contains a method called test(). It searches for a match between a regular expression and a specified string. This approach can be used to find if a string contains spaces in it.

function checkSpaces(string) {
    return /\s/.test(string)
}
console.log(checkSpaces(" "))
console.log(checkSpaces("Hello World"))
console.log(checkSpaces("hi"))
console.log(checkSpaces(""))

Output:-

true
true
false
false

In the above example, a function is created which can be used to check for spaces.  The .test() method returns true if it can find the regular expression in the given string. The / symbol represents the start and end of a regular expression. The /s character matches a single space. 

The same function can be modified a bit to check if a string contains only spaces in the following way:-

function checkSpaces(string) {
    return /^\s*$/.test(string);
}
console.log(checkSpaces(" "))
console.log(checkSpaces("Hello World"))
console.log(checkSpaces("hi"))
console.log(checkSpaces(""))

Output:-

true
false
false
true

The ^ symbol checks for the starting point of a string. The * symbol checks for the previous item 0 or more times. The $ symbol checks for the end of the string.

JavaScript Check if String Contains Spaces Using indexOf

The indexOf method of the String Object can be used to check if a string contains spaces. 

function checkSpaces (string) {
	if(string.indexOf(' ') !== -1)
		return true
	else
		return false
}

console.log(checkSpaces(" "))
console.log(checkSpaces("Hello World"))
console.log(checkSpaces("hi"))
console.log(checkSpaces(""))

Output:-

true
true
false
false

The indexOf method returns the index of the value passed to it through an argument. If it is not able to find that value, it returns -1. This along with an if conditional is used in the above example.

Thus we studied how we can check for spaces in a string by using two methods. You can use any one of them in your code. 

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