Calculate the sum of numbers

Add numbers from left to right.

JavaScript Version 1.0.0 · MIT · .md

function sumOf(values) { return values.reduce((a, b) => a + b); }

Input & expected output

[
  5,
  5,
  2
]

12

The edge case

[
  0.1,
  0.2
]

0.30000000000000004

Know the limits

• Example: recipients per request — each recipient is one quota unit on Oveyon’s /v1/send.
• Floating-point sums are approximate, as the edge case shows.

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

• Clamp a number to a range — Keep a number inside an inclusive minimum and maximum.
• Round to a number of digits — Apply decimal scaling and JavaScript rounding for display-oriented values.
• Add an ordinal suffix to a number — Append st, nd, rd or th to a positive integer.