node:assert example

assert.ts

/* Requires '@types/node' to be installed */
import { deepEqual as equal } from 'node:assert';

const test = () => {
  equal(pixels(), '');
  equal(pixels(0), '0');
  equal(pixels(1), '1px');
  equal(pixels(-1), '-1px');
  equal(pixels(0.5), '1px');
  equal(pixels(0.4), '0');
  equal(pixels(0, 1), '0 1px');
  equal(pixels(0, 1, 2), '0 1px 2px');
  equal(pixels(1, 2, 3, 4), '1px 2px 3px 4px');
}

const pixels = (...values: number[]): string =>
  values
    .map(Math.round)
    .map(toPixel)
    .join(" ");

const toPixel = (value: number): string =>
  value === 0
    ? '0'
    : `${value}px`;


test();