ValidAnagram.js

function ValidAnagram(first, second) {
 	if(first.length !== second.length){
  return false;
 }
  
 const lookup = {};
 
  for(let i = 0; i < first.length; i++){
    let letter = first[i];
    // if letter exists, increment or set to 1
    lookup[letter] ? lookup[letter] += 1 : lookup[letter] = 1;
  }
  
  console.log(lookup);
  
  for(let i = 0; i < second.length; i++) {
    let letter = second[i];
    
    // cant find letter or letter is zero then its not a anagram
    if(!lookup[letter]) {
      return false;
    } else {
     lookup[letter] -= 1; 
    }
  }
  
  return true;
}

console.log(ValidAnagram("card", "darc"));
console.log(ValidAnagram("card", "larc"));