quangnd

//Example 1 - Calculate average value of an array (transform array into a single number)
  var scores = [89, 76, 47, 95]
  var initialValue = 0
  var reducer = function (accumulator, item) {
    return accumulator + item
  }
  var total = scores.reduce(reducer, initialValue)
  var average = total / scores.length
/*Explain about function