Remove all whitespaces from string - JavaScript

We are required to write a JavaScript function that takes in a string and returns a new string with all the characters of the original string but with whitespaces removed.

Method 1: Using a For Loop

This approach iterates through each character and builds a new string excluding spaces:

const str = "This is an example string from which all whitespaces will be removed";
const removeWhitespaces = str => {
    let newStr = '';
    for(let i = 0; i < str.length; i++){
        if(str[i] !== " "){
            newStr += str[i];
        }
    }
    return newStr;
};
console.log(removeWhitespaces(str));

Thisisanexamplestringfromwhichallwhitespaceswillberemoved

Method 2: Using replace() with Regular Expression

The replace() method with regex /\s/g removes all whitespace characters globally:

const str = "This is an example string from which all whitespaces will be removed";
const removeWhitespaces = str => str.replace(/\s/g, '');

console.log(removeWhitespaces(str));

Thisisanexamplestringfromwhichallwhitespaceswillberemoved

Method 3: Using split() and join()

Split the string by spaces and join the parts back together:

const str = "This is an example string from which all whitespaces will be removed";
const removeWhitespaces = str => str.split(' ').join('');

console.log(removeWhitespaces(str));

Thisisanexamplestringfromwhichallwhitespaceswillberemoved

Comparison

Handling Different Whitespace Types

The regex method handles all whitespace characters including tabs and newlines:

const str = "Text with\ttabs\nand\r\nnewlines   and spaces";
console.log("Original:", str);
console.log("Cleaned:", str.replace(/\s/g, ''));

Original: Text with	tabs
and

newlines   and spaces
Cleaned: Textwithtabsandnewlinesandspaces

Conclusion

Use replace(/\s/g, '') for the most comprehensive whitespace removal. For simple space removal, split(' ').join('') offers excellent readability.