In this article, we are given a string str, you need to find whether the given string contains whitespace characters or not in JavaScript. Whitespaces can occur at any position whether at the beginning or in between or at the end of the string.
Example 1:
Input:
str = Hi I am a Geek
Output:
The string contains whitespace characters
Explanation:
In the input string "Hi I am a geek" there are 4 whitespace characters which is shown by "_" :
Hi_I_am_a_Geek
So we return "The string contains whitespace characters"
Example 2:
Input:
str = helloWorld
Output:
The string does not contains whitespace characters
Approaches to check if a string contains any whitespace characters
- Using regular expressions
- Using JavaScript Sets
Approach 1: Using regular expressions
To determine whether a string contains whitespace characters we can make use of regular expressions. A regular expression (regex) is a sequence of characters that define a search pattern. The “\s” metacharacter is used to match the whitespace character.
Example: Below is the implementation of the approach
Javascript
function checkWhitespace(str) { return /\s/.test(str); } let str = "Hi I am a Geek"; if (checkWhitespace(str)) { console.log( "The string contains whitespace characters." ); } else { console.log( "The string does not contain whitespace characters." ); } |
Output
The string contains whitespace characters.
Approach 2: Using JavaScript Sets
- Create a new Set which contains whitespace characters i.e. space, \n, \t.
- Iterate over the string and check whether the set contains any character of the string in it.
- If it contains any character of the string it means that the string contains whitespace characters.
- Return true else return false.
Example: Below is the implementation of the approach
Javascript
function checkWhitespace(str) { let whitespace = new Set([" ", "\t", "\n"]); for (let i = 0; i < str.length; i++) { if (whitespace.has(str[i])) { return true; } } return false; } let str = "neveropen"; if (checkWhitespace(str)) { console.log( "The string contains whitespace characters." ); } else { console.log( "The string does not contain whitespace characters." ); } |
Output
The string does not contain whitespace characters.
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