how to sum all numbers in a n array javascript code example

Example 1: js sum of array

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

// Output: 10

Example 2: javascript sum of array

const sum = arr => arr.reduce((a, b) => a + b, 0);

Example 3: sum of all elements in array javascript

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