Sum arrays in array (JavaScript) [duplicate]

Answer 1

You can use Array#map to return the new items. The items can be prepared using Array#reduce to sum up all the inner elements.

var array = [[1], [2, 1, 1], [3, 4]];

var newArray = array
  .map(arr => arr.reduce((sum, item) => sum += item, 0));

console.log(newArray);