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chapter10.js
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chapter10.js
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var Task = require('folktale').data.task.task;
const R = require('ramda')
const Maybe = require('ramda-fantasy').Maybe
const IO = require('ramda-fantasy').IO
const localStorage = {}
// practice 1
var ex1 = (x, y) => Maybe.of(R.add).ap(Maybe(x)).ap(Maybe(y))
console.log('practice 1')
console.log(ex1(1, 3))
//practice 2
var ex2 = (x, y) => R.lift(R.add)(x, y)
console.log('practice 2')
console.log(ex2(Maybe(1), Maybe(2)))
// practice 3
var makeComments = R.reduce(function (acc, c) {
return acc + "<li>" + JSON.stringify(c) + "</li>"
}, "");
var render = R.curry(function (p, cs) {
return "<div>" + p.title + "< / div > " + makeComments(cs);
});
var getPost = function (i) {
return Task(function (resolver) {
setTimeout(function () {
resolver.resolve({
id: i,
title: 'Love them tasks'
});
}, 1);
});
}
var getComments = function (i) {
return Task(function (resolver) {
Math.random() > 0.7 ? resolver.reject('errorerror') :
setTimeout(function () {
resolver.resolve([{
post_id: i,
body: "This book should be illegal"
}, {
post_id: i,
body: "Monads are like smelly shallots"
}]);
}, 1);
});
}
var ex3 = R.lift(render)(getPost(1), getComments(1))
console.log('practice 3')
ex3.run().promise().then(
err => console.error(err),
x => console.log(x)
)
// practice 4
localStorage.player1 = 'toby'
localStorage.player2 = 'sally'
var getCache = x => new IO(() => localStorage[x])
var game = R.curry((p1, p2) => p1 + ' vs ' + p2)
console.log('practice 4')
console.log(R.lift(game)(getCache('player1'), getCache('player2')).runIO())