/*
Given an array of elements, find result array where each elements are product of all elements except for the current element.
Eg: [1,2,3,4,5] result array to be [ 120, 60, 40, 30, 24 ]
*/

function productArray(arr){
  let zeroFlag = false,
      zIndex = null,
      resultArray = [];

  let productOfElements = arr.reduce( (accum, currValue, currIndex) =>{
    //Handling zero element setting zero flag if present
    if(currValue === 0) {
      zeroFlag = true;
      zIndex = currIndex;
    }
    //the product would be zero if any element is zero
    return currValue !== 0 ? accum * currValue : accum * 1;

  }, 1);

  if(zeroFlag) {
    resultArray = Array(arr.length).fill(0);
    resultArray.splice(zIndex, 1, productOfElements);
  }
  else {
    arr.map( (currValue, idx) => {
      resultArray.push(productOfElements / arr[idx]);
    });
  }

  return resultArray;
}

productArray([1,2,3,4,5])