reduce sum by item in array of items javascript code example

Example 1: sum of number using reduce

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

Example 2: javascript reduce sum

let nums = [1, 2, 3];

nums.reduce((curr, next) => curr + next);