Calculate the average of numbers

Divide the sum by the count.

JavaScript Version 1.0.0 · MIT · .md

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

Input & expected output

[
  1,
  2,
  3,
  4
]

2.5

The edge case

[
  7
]

7

Know the limits

• The lab passes one array with at least one number.

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.