javascript reduce 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)arrSum = function(arr){  return arr.reduce(function(a,b){    return a + b  }, 0);}let nums = [1, 2, 3];

nums.reduce((curr, next) => curr + next);[1,2,3,4,5].reduce((acc, current)=>acc+current, 0)
Source

Also in JavaScript: