sum javascirpt code example

Example 1: sum javascript

console.log(
  [1, 2, 3, 4].reduce((a, b) => a + b, 0)
)
console.log(
  [].reduce((a, b) => a + b, 0)
)

Example 2: reduce mdn

array.reduce(callback( accumulator, valueNow[, index[, array]] )[, initialValue]))