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mod ​

Problem ​

You need a true mathematical modulo that always returns a non-negative result — unlike JavaScript's % operator, which can return negative values for negative operands.

Solution ​

Use mod(a, b) for a non-negative modulo.

ts
import { mod } from '@vielzeug/arsenal';

mod(7, 3); // 1
mod(-1, 7); // 6  (JS % would give -1)
mod(10, 5); // 0

Pitfalls ​

  • % in JavaScript is the remainder operator, not true modulo. For negative a, a % b is negative; mod(a, b) is always [0, b).