Subtract numbers

Subtract each number from the first in turn.

JavaScript Version 1.0.0 · MIT · .md

function subtract(values) { return values.reduce((a, b) => a - b); }

Input & expected output

[
  10,
  3,
  2
]

5

The edge case

[
  0.3,
  0.1
]

0.19999999999999998

Know the limits

• Binary floating-point: 0.3 − 0.1 is not exactly 0.2, 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.