Sum an array of numbers

Add numeric values with an explicit result for an empty array.

JavaScript Version 1.0.0 · MIT · .md

function sum(values) { return values.reduce((total, value) => total + value, 0); }

Input & expected output

[
  4,
  8,
  3
]

15

The edge case

[]

0

Know the limits

• Floating-point arithmetic is approximate; use integer minor units or a decimal library for money.
• The lab bounds values to ±1 billion and arrays to 1,000 total items.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Clone an array — Create a new array without copying the objects inside it.
• Remove duplicate values — Keep the first occurrence of each value, in its original order.
• Flatten a nested array — Turn a nested array into one sequence of values.