Possible ways to iterate a string in JavaScript

First, we need to understand the basic ways to get the char at a particular index in the string. There are two ways basically.

str.chatAt(index)

• charAt() method returns a new string, at particular given index.
• Supported in Old browsers (IE7 too)
• If no index passed, takes index, by default 0
• If out of range index, returns empty string

Bracket Notation (str[index])

• Bracket method returns char at particular given index.
• It was introduced in ECMAScript 2015 but breaks in old browsers
• If no index passed, throws syntax error
• If out of range index, returns undefined

Iterating over the string -

1. For Loop

   const str = "pankaj";
   for (let index = 0; index < str.length; index ++) {
           console.log(str[index]) // str.charAt(index)
   }
   

2. for..of

   const str = "pankaj";
   for (let c of str ) {
        console.log(c);
   }
   

3. forEach()

   const str = "pankaj";
   [...str].forEach( (c) => console.log(c) );
   

BONUS => Downside of bracket notation is that, it cant be used to assign a character

let str = "pankaj"
str[0] = "t"
console.log(str) // "pankaj"