Sum of Even Numbers

ArrayMath

Given an array of integers, return the sum of all even numbers in the array.

Example 1

Input

[
  2,
  5,
  3,
  10,
  4
]

Output

Explanation. Sum of even numbers 2, 10, and 4 is 16.

Example 2

Input

Output

Explanation. There are no even numbers in the input array.

Example 3

Input

[
  -2,
  -4,
  -6
]

Output

-12

Explanation. Sum of even numbers -2, -4, and -6 is -12.

Example 4

Input

[
  0,
  1,
  2,
  3,
  4
]

Output

Explanation. Sum of even numbers 0, 2, and 4 is 6.

Follow-up: Can you solve this problem in a more efficient way using a functional programming style in JavaScript?

Constraints:

The input array may contain zero, positive, and negative numbers.