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Dominic / pull-stream



Tree: 019de9e4266b7574ce6cf22a56c1cb051638fe1a

Files: 019de9e4266b7574ce6cf22a56c1cb051638fe1a / test / pull.js

1836 bytesRaw
1var tape = require('tape')
2
3function curry (fun) {
4 return function () {
5 var args = [].slice.call(arguments)
6 return function (read) {
7 args.unshift(read)
8 return fun.apply(null, args)
9 }
10 }
11}
12
13var pull = require('../')
14
15function values (array) {
16 var i = 0
17 return function (abort, cb) {
18 if(abort) i = array.length, cb(abort)
19 else if(i >= array.length) cb(true)
20 else cb(null, array[i++])
21 }
22}
23
24var map = curry(function (read, mapper) {
25 return function (abort, cb) {
26 read(abort, function (end, data) {
27 if(end) cb(end)
28 else cb(null, mapper(data))
29 })
30 }
31 })
32
33var sum = curry(function (read, done) {
34 var total = 0
35 read(null, function next (end, data) {
36 if(end) return done(end === true ? null : end, total)
37 total += data
38 read(null, next)
39 })
40 })
41
42var log = curry(function (read) {
43 return function (abort, cb) {
44 read(abort, function (end, data) {
45 if(end) return cb(end)
46 console.error(data)
47 cb(null, data)
48 })
49 }
50 })
51
52tape('wrap pull streams into stream', function (t) {
53
54 pull(
55 values([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]),
56 map(function (e) { return e*e }),
57 log(),
58 sum(function (err, value) {
59 console.log(value)
60 t.equal(value, 385)
61 t.end()
62 })
63 )
64
65})
66
67tape('turn pull(through,...) -> Through', function (t) {
68
69 pull(
70 values([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]),
71 pull(
72 map(function (e) { return e*e }),
73 log()
74 ),
75 sum(function (err, value) {
76 console.log(value)
77 t.equal(value, 385)
78 t.end()
79 })
80 )
81
82})
83
84// pull(
85// values ([1 2 3 4 5 6 7 8 9 10])
86// pull(
87// map({x y;: e*e })
88// log()
89// )
90// sum({
91// err value:
92// t.equal(value 385)
93// t.end()
94// })
95// )
96//
97
98

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