Validate input: replace all ‘a’ with ‘@’ and ‘i’ with ‘!’JavaScript

We are required to write a function validate() that takes in a string as one and only argument and returns another string that has all ‘a’ and ‘i’ replaced with ‘@’ and ‘!’ respectively.

It’s one of those classic for loop problems where we iterate over the string with its index and construct a new string as we move through.

The code for the function will be −


const string = 'Hello, is it raining in Amsterdam?';
const validate = (str) => {
   let validatedString = '';
   for(let i = 0; i < str.length; i++){
      if(str[i] === 'a'){
         validatedString += '@';
      }else if(str[i] === 'i'){
         validatedString += '!';
         validatedString += str[i];
   return validatedString;


The output in the console will be −

Hello, !s !t r@!n!ng !n Amsterd@m?