JSFiddle - React, Tailwind, and code Playground

by TCloud

JavaScript

function findMissingLetter(array)
{
  
  /* for (let i = 0; i < array.length; i++) {
    if( i < array.length - 1 && array[i].charCodeAt(0) + 1 != array[i + 1].charCodeAt(0) ) {
      return String.fromCharCode( array[i].charCodeAt(0) + 1 )
    }
  } */
  let res;
  return array.map( (item, i) => {
  	if( i < array.length - 1 && item.charCodeAt(0) + 1 != array[i + 1].charCodeAt(0) ) {
    	res = String.fromCharCode( item.charCodeAt(0) + 1 )
    }
  } )
  
  return res
}

console.log( findMissingLetter(['a','b','c','d','f']) )