Day of Week

dayOfWeek.test.ts

import { getDayOfWeek } from './dayOfWeek'
import test from 'node:test'
import assert from 'node:assert/strict'

describe('dayOfWeek', () => {
  test('returns Sunday', () => {
    assert.strictEqual(getDayOfWeek(1), ('Sunday'))
  })
  test('returns Monday', () => {
    assert.strictEqual(getDayOfWeek(2), ('Monday'))
  })
  test('returns Tuesday', () => {
    assert.strictEqual(getDayOfWeek(3), ('Tuesday'))
  })
  test('returns Wednesday', () => {
    assert.strictEqual(getDayOfWeek(4), ('Wednesday'))
  })
  test('returns Thursday', () => {
    assert.strictEqual(getDayOfWeek(5), ('Thursday'))
  })
  test('returns Friday', () => {
    assert.strictEqual(getDayOfWeek(6), ('Friday'))
  })
  test('returns Saturday', () => {
    assert.strictEqual(getDayOfWeek(7), ('Saturday'))
  })
})

dayOfWeek.ts

import { partial, pipe } from 'ramda'

export const getDayOfWeek = pipe(
  partial(Date.UTC, [1984, 3]),
  Intl.DateTimeFormat(undefined, { weekday: 'long' }).format
)