5 ms·

function sum(array) { return array.reduce((a, b) => a + b); } With a loop: function sum(array) { let acc = 0; for(let val of array)

by ahoge 11y ago

function sum(array) { return array.reduce((a, b) => a + b); } With a loop: function sum(array) { let acc = 0; for(let val of array) { acc += val; } return acc; }

eru 11y ago
What's the value of sum for an empty array in your example?
- ahoge 11y ago
  The reduce one needs an initial value of 0 for that to work. Then both versions will return 0 if the array is empty. array.reduce((a, b) => a + b, 0);