convert array of array to array reduce code example

Example 1: javascript reduce

var array = [36, 25, 6, 15];

array.reduce(function(accumulator, currentValue) {
  return accumulator + currentValue;
}, 0); // 36 + 25 + 6 + 15 = 82

Example 2: javascript reduce

const sum = array.reduce((accumulator, element) => {
  return accumulator + element;
}, 0);