Reverse a String in JavaScript. Show us multiple ways to do it. - Whiteboard

Question

Amit · Accepted Answer

String.prototype.reverse  = function(){
   return this.split('').reverse().join(''); 
}

Multiple approaches · Answer

1. Reverse order iteration
const reverseString = (str) => {
  let reversedStr = '';
  for (let i = str.length - 1; i >= 0; i--) {
    reversedStr += str[i];
  }
  return reversedStr;
};

2. Hal-index recursion
const reverseString = (str) => {
  if (str.length < 2) {
    return str;
  }
  const halfIndex = Math.ceil(str.length / 2);
  return reverseString(str.substr(halfIndex)) + reverseString(str.substr(0, halfIndex));
};

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