In JavaScript, we can use the trim() method to remove leading and trailing whitespaces from a string. This method is available in ECMAScript 5 and above.
Syntax: string.trim()
Example:
let str = " Hello, World! ";
let trimmedStr = str.trim();
console.log(trimmedStr); // Output: "Hello, World!"
In the above example, the trim() method removes the leading and trailing whitespaces from the string str, and the resulting trimmed string is stored in the variable trimmedStr. The final output shows the trimmed string without any leading or trailing whitespaces.
We can also chain the trim() method with other string methods to perform various operations on a trimmed string.
Example:
let str = " Hello, World! ";
let reversedStr = str.trim().split("").reverse().join("");
console.log(reversedStr); // Output: "!dlroW ,olleH"
In this example, the trim() method is combined with the split(), reverse(), and join() methods to create a new string that is the reverse of the trimmed string. The final output shows the reversed string without any leading or trailing whitespaces.