How to reverse a string in pairs-CodePudding

If you have a string "abcdef", how would you go about reversing pairs so it would look like "badcfe"? If the string has an odd number of characters, leave the last character in place.

I am aware of x.spilt('').reverse().join('') to reverse an entire string but couldn’t figure out the above stated.

CodePudding user response：

You can just use a simple for-loop:

function reversePairs(str) {
  let ret = "";
  for (let i = 0; i < str.length; i  = 2) {
    ret  = str.substring(i, i 2).split('').reverse().join('');
  }
  return ret;
}

const str = 'abcdef';
console.log(reversePairs(str))

CodePudding user response：

You can do with the same solution you mentioned in the question, but the approach of loop should be diffrent.

You can take this as reference