/
array.js
117 lines (98 loc) · 2.2 KB
/
array.js
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var test = require('tap').test
var AsyncArray = require('../lib/async-array')
test('filter', function(t) {
var origin = AsyncArray([1, 2, 3, 4, 5, 6])
return origin.filter(isOdd)
.then(function (res) {
t.same(res, [1, 3, 5], 'async')
})
})
test('map', function(t) {
var origin = AsyncArray([1, 3, 5])
return origin.map(function (v) {
return Promise.resolve()
.then(function () {
return v + 1
})
})
.then(function (res) {
t.same(res, [2, 4, 6], 'promise')
})
})
test('series', function(t) {
var origin = AsyncArray([1, 3, 5])
var delays = [10, 0, 20]
return origin.series(function (v, i, arr, next) {
setTimeout(function() {
next(null, v + 1)
}, delays[i])
})
.then(function (res) {
t.same(res, [2, 4, 6])
})
})
test('reduce', function(t) {
var origin = AsyncArray([1, 3, 5])
return origin.reduce(function (a, b) {
return a + b
})
.then(function (res) {
t.same(res, 9, 'sync')
})
})
test('forEach', function(t) {
t.plan(2)
var arr = AsyncArray([1, 3, 5])
arr.forEach(function (v, i, o) {
o[i] = v + 2
}).then(function (res) {
t.same(res, [3, 5, 7])
return arr
}).then(function (res) {
t.same(res, [3, 5, 7])
})
})
test('chain', function(t) {
t.plan(4)
var origin = AsyncArray([1, 2, 3, 4, 5, 6])
var odd = origin.filter(isOdd)
var even = origin.filter(isEven)
var flag = origin.filter(isOdd).reduce(flagMap, {})
odd.then(function (res) {
t.same(res, [1, 3, 5])
})
even.then(function (res) {
t.same(res, [2, 4, 6])
})
flag.then(function (res) {
t.same(res, { 1: true, 3: true, 5: true })
})
even.reduce(flagMap, {}).then(function (res) {
t.same(res, { 2: true, 4: true, 6: true })
})
})
test('error', function(t) {
t.plan(1)
AsyncArray(['a', 1, 'b']).map(function (v) {
return v.toUpperCase()
})
.catch(function (err) {
t.ok(err instanceof Error)
})
})
function isOdd(n, i, arr, next) {
process.nextTick(function () {
next(null, n % 2)
})
}
function isEven(n) {
return new Promise(function (resolve) {
process.nextTick(function () {
resolve((n + 1) % 2)
})
})
}
function flagMap(o, v) {
o[v] = true
return o
}