moy-fp/test/Functor/of.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * Functor f => f -> a -> f a
 */
import of from '../../src/Functor/of'
import Identity from '../../src/Functor/Identity/index'

/**
 * you should not use this similar funciton to get value anywhere in your application
 * if you must need the inner value, you may need Comonad
 * here is just simple for test
 */
const inspect = x => `Identity(${x.value})`

test('of(not using __), array', () => {
  expect(
    of(Array)(12)
  ).toEqual([12])
})

test('of(not using __), identity', () => {
  expect(
    inspect(of(Identity)(12))
  ).toBe('Identity(12)')
})

test('of(using __), identity', () => {
  expect(
    inspect(of(__, 12)(Identity))
  ).toBe('Identity(12)')
})