reduce sum array code example

Example 1: js sum of array

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

// Output: 10

Example 2: javascript reduce sum

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

Example 3: .reduce mdn

arr.reduce(callback( accumulator, currentValue[, index[, array]] )[, initialValue])