Create a polyfill for array reduce

Question

This works for me · Accepted Answer

Array.prototype.myReduce = function (callback, initialValue) {
    let accumulator;
  let firstIndex = 0;
  
  if (arguments.length === 1) {
    accumulator = this[0];
    firstIndex = 1;
  } else {
    accumulator = initialValue;
  }
  
  for (let i = firstIndex; i < this.length; i++) {
    accumulator = callback(accumulator, this[i], i, this);
  }
  return accumulator;
}

Sigiloso · Answer

Below solution works for me:

Array.prototype.myReduce = function (callback, initialValue) {
  let accumulator;
  let firstIndex;
  if (arguments.length === 1) {
    accumulator = this[0];
    firstIndex = 1;
  } else {
    accumulator = initialValue;
    firstIndex = 0;
  }
  for (let index = firstIndex; index < this.length; index++) {
    accumulator = callback(accumulator, this[index], index, this);
  }
  return accumulator;
};

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