Reverse String - JS

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function reverseString(str) {
  let arr, t;

  let n = [];

  arr = str.split('');

  t = arr.length -1;

  for(let i = 0; i< arr.length; i++){
    n.push(arr[t]);
    t--;
  }
  
  arr = n.join('')
  return arr;
}

reverseString("I am a dumbass");