Print the sum of the array's elements as a single integer. javascript code example

Example 1: sum all elements in array javascript

arr.reduce((a, b) => a + b)

Example 2: sum of all elements in array javascript

arrSum = function(arr){  return arr.reduce(function(a,b){    return a + b  }, 0);}

Example 3: js array sum

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