es6 array sum javascript

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