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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| const { add, curry, reduce } = require('..') | ||
| const { liftA2, Maybe, Task, IO } = require('../functors') | ||
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| // TEST HELPERS | ||
| // ===================== | ||
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| const getPost = i => | ||
| new Task((rej, res) => | ||
| setTimeout(() => res({ id: i, title: 'Love them futures' }), 300) | ||
| ) | ||
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| const getComments = i => | ||
| new Task((rej, res) => | ||
| setTimeout( | ||
| () => | ||
| res(['This book should be illegal', 'Monads are like space burritos']), | ||
| 300 | ||
| ) | ||
| ) | ||
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| // fib browser for test | ||
| const localStorage = {} | ||
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| describe('You are now an APPLICATIVE FUNCTOR genius!!! 馃 馃憦馃徏 馃憦馃徏 馃憦馃徏', () => { | ||
| // Exercise 1 | ||
| test('Write a function that adds two possibly null numbers together using Maybe and ap().', () => { | ||
| // ex1 :: Number -> Number -> Maybe Number | ||
| const ex1 = (x, y) => | ||
| Maybe.of(add) | ||
| .ap(Maybe.of(x)) | ||
| .ap(Maybe.of(y)) | ||
| expect(ex1(2, 3)).toEqual(Maybe.of(5)) | ||
| expect(ex1(null, 3)).toEqual(Maybe.of(null)) | ||
| }) | ||
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| // Exercise 2 | ||
| test("Now write a function that takes 2 Maybe's and adds them. Use liftA2 instead of ap().", () => { | ||
| // ex2 :: Maybe Number -> Maybe Number -> Maybe Number | ||
| const ex2 = liftA2(add) | ||
| expect(ex2(Maybe.of(2), Maybe.of(3))).toEqual(Maybe.of(5)) | ||
| expect(ex2(Maybe.of(null), Maybe.of(3))).toEqual(Maybe.of(null)) | ||
| }) | ||
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| // Exercise 3 | ||
| test('Run both getPost(n) and getComments(n) then render the page with both. (The n arg is arbitrary.)', () => { | ||
| const makeComments = reduce((acc, c) => `${acc}<li>${c}</li>`, '') | ||
| const render = curry( | ||
| ({ title }, cs) => `<div>${title}</div>${makeComments(cs)}` | ||
| ) | ||
| // ex3 :: Task Error HTML | ||
| const ex3 = liftA2(render, getPost(13), getComments(13)) | ||
| ex3.fork(console.log, html => | ||
| expect(html).toBe( | ||
| '<div>Love them futures</div><li>This book should be illegal</li><li>Monads are like space burritos</li>' | ||
| ) | ||
| ) | ||
| }) | ||
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| // Exercise 4 | ||
| test('Write an IO that gets both player1 and player2 from the cache and starts the game.', () => { | ||
| localStorage.player1 = 'toby' | ||
| localStorage.player2 = 'sally' | ||
| const getCache = x => new IO(() => localStorage[x]) | ||
| const game = curry((p1, p2) => `${p1} vs ${p2}`) | ||
| // ex4 :: IO String | ||
| const ex4 = liftA2(game, getCache('player1'), getCache('player2')) | ||
| expect(ex4.unsafePerformIO()).toBe('toby vs sally') | ||
| }) | ||
| }) |
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