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Frequency Counter example




function validAnagram(str1str2) {
  // add whatever parameters you deem necessary - good luck!
  if (str1.length !== str2.length) {
    return false;
  }

  const lookup = {};

  for (let i = 0i < str1.lengthi++) {
    let letter = str1[i];
    lookup[letter? (lookup[letter+= 1: (lookup[letter= 1);
  }

  console.log(lookup);

  for (let j = 0j < str2.lengthj++) {
    let letter = str2[j];
    if (!lookup[letter]) {
      return false;
    } else {
      lookup[letter-= 1;
    }
  }

  return true;
}

validAnagram("""");
validAnagram("aaz""zza");
validAnagram("anagram""nagaram");




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