Home

Index

How to use the map function from pull-stream

Find comprehensive JavaScript pull-stream.map code examples handpicked from public code repositorys.

pull-stream.map is a function that transforms the data in a pull-stream by applying a provided function to each item in the stream.

pull-stream.md?plain=1

190
191
192
193
194
195
196
197
198
   map((i) => i * 10)
--10--30-50----70-----
```
```js
const source = pull.values([ 1, 3, 5, 7])
const through = pull.map((i) => i * 10)
const sink = pull.log()
pull(source, through, sink)
```

839

index.js

GitHub: ssbc/jitdb

1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
pullAsync((cb) =>
  onReady(() => {
    executeOperation(op, (err) => cb(err))
  })
),
pull.map(() => {
  let offset = -1
  let seqStream

  function detectOffsetAndSeqStream(ops) {

How does pull-stream.map work?

pull-stream.map is a function used in pull-stream programming, which is a type of data processing that involves a source, a transformation function, and a sink.

When used, pull-stream.map takes a stream of data and a function as arguments. The function provided to pull-stream.map is then applied to each item in the stream, transforming the data as it flows through the pipeline.

The transformed data is then passed downstream to the next stage of the pipeline for further processing or output.

pull-stream.map is a useful tool for manipulating data in a pull-stream, as it allows you to apply a function to each item in the stream without modifying the original data source.

migrate.js

GitHub: ssbc/ssb-db2

377
378
379
380
381
382
383
384
385
386
}

pull(
  oldLog.getStream({ gt: migratedOffset }),
  pull.map(updateMigratedSizeAndPluck),
  pull.map(toBIPF),
  pull.asyncMap(writeToNewLog),
  (drainAborter = config.db2.maxCpu
    ? drainGently(tooHotOpts(config), op, opDone)
    : pull.drain(op, opDone))

index.js

GitHub: ssbc/ssb-tribes

246
247
248
249
250
251
252
253
254
255
      pull.values(keystore.group.list()),
      paraMap(tribeGet, 4),
      opts.subtribes
        ? null
        : pull.filter(tribe => tribe.parentGroupId === undefined),
      pull.map(tribe => tribe.groupId),
      pull.collect(cb)
    )
  })
}

Ai Example

1
2
3
4
5
6
7
8
const pull = require("pull-stream");
const numbers = [1, 2, 3, 4, 5];

pull(
  pull.values(numbers),
  pull.map((n) => n * 2),
  pull.log()
);

In this example, we're using pull.values to create a stream from an array of numbers, and then piping it through pull.map to double each number in the stream. Finally, we're using pull.log to output the transformed data to the console. When we run this code, we get the following output: Copy code

index.js

GitHub: ssbc/ssb-replication-scheduler

74
75
76
77
78
79
80
81
82
83
  return
}

pull(
  ssb.tribes2.list({ live: true }),
  pull.map((group) =>
    pull(
      ssb.tribes2.listMembers(group.id, { live: true }),
      pull.map((groupMemberId) => ({
        groupSecret: group.secret,

+ 147 other calls in file

count-group-feeds.js

GitHub: ssbc/ssb-tribes2

5
6
7
8
9
10
11
12
13
14
15


module.exports = function countGroupFeeds(server, cb) {
  pull(
    server.metafeeds.branchStream({ old: true, live: false }),
    pull.filter((branch) => branch.length === 4),
    pull.map((branch) => branch[3]),
    pull.filter((feed) => feed.recps),
    pull.collect((err, feeds) => {
      if (err) return cb(err)
      return cb(null, feeds.length)

index.js

GitHub: ssbc/ssb-tribes2

194
195
196
197
198
199
200
201
202
203
ssb.db.query(
  where(and(isDecrypted('box2'), type('group/add-member'))),
  opts.live ? live({ old: true }) : null,
  toPullStream()
),
pull.map((msg) => lodashGet(msg, 'value.content.recps', [])),
pull.filter((recps) => recps.length > 1 && recps[0] === groupId),
pull.map((recps) => recps.slice(1)),
pull.flatten(),
pull.unique()

+ 98 other calls in file

reactive.html

GitHub: juliangruber/level-list

263
264
265
266
267
268
269
270
271
272
exports.createWriteStream = function (db, opts, done) {
  if('function' === typeof opts)
    done = opts, opts = null
  opts = opts || {}
  return pull(
    pull.map(function (e) {
      if(e.type) return e
      return {
        key   : e.key, 
        value : e.value,

+ 3 other calls in file

list.js

GitHub: elavoie/ssb-tokens

39
40
41
42
43
44
45
46
47
48
        })
    }),
    pull.filter((obj) => obj !== null)
  )
} else {
  list = pull(pull.values(ids), pull.map((id) => ({ id: id })))
}

var print = null
if (args['only-id']) {

+ 69 other calls in file

resolvers.js

GitHub: planetary-social/planetary-graphql

97
98
99
100
101
102
103
104
105
106
  ),
  descending(), // latest => oldest
  toPullStream()
),
pull.filter(m => m.value.author === m.value.content.about),
pull.map(m => m.value.author),
pull.unique(),
pullParaMap((feedId, cb) => {
  getProfile(feedId)
    .then(profile => cb(null, profile))

+ 5 other calls in file

get-tangle-data.test.js

GitHub: ssbc/ssb-tribes2

40
41
42
43
44
45
46
47
48
server.db.query(
  where(or(author(group.subfeed.id), author(additions.id))),
  descending(),
  toPullStream()
),
pull.map((m) => fromMessageSigil(m.key)),
pull.take(1),
pull.collect((err, keys) => {
  t.error(err, 'no error')

+ 2 other calls in file

add.js

GitHub: Paratii-Video/js-ipfs

48
49
50
51
52
53
54
55
56
57
pull.map((pair) => ({
  path: pair[0],
  isDirectory: pair[1].isDirectory()
})),
pull.filter((file) => !file.isDirectory),
pull.map((file) => ({
  path: file.path.substring(index, file.path.length),
  originalPath: file.path
})),
pull.map((file) => ({

+ 15 other calls in file

plugin.js

GitHub: achou11/ssb-storage-used

178
179
180
181
182
183
184
185
186

  // @ts-ignore
  return pull(
    chunkedStream,
    pull.filter((chunk) => chunk.length > 0),
    pull.map(pull.values),
    pull.flatten()
  )
}

bundle.js

GitHub: darsee/taco-demo

125
126
127
128
129
130
131
132
133
134
exports.writeStream = 
exports.createWriteStream = function (db, opts, done) {
  if('function' === typeof opts)
    done = opts, opts = null
  opts = opts || {}
  return pull.map(function (e) {
    if(e.type) return e
    return {
      key   : e.key, 
      value : e.value,

+ 5 other calls in file

pull-stream.js

GitHub: scrapjs/stream-contest

14
15
16
17
18
19
20
21
22
23
    return util.noise(util.create(frameSize))
  })
}

function volume () {
  return pull.map(function (data) {
    util.fill(data, v => v * .01);
    return data
  })
}

test.js

GitHub: regular/flumeview-level-transform

21
22
23
24
25
26
27
28
29
30
      version: 1,
      since: 0,
      continuation: { key: 1, value: { foo: 'bar', bar: 'foo' }, type: 'put' }
    })
  }
  return pull.map(x => {
    x.value.bar = 'foo'
    return x
  })
}

send.js

GitHub: mkg20001/libp2p-tls

37
38
39
40
41
42
43
44
45
46

function sendMessages (local, remote) {
  pull(
    pull.infinite(),
    pull.take(100),
    pull.map((val) => Buffer.from(val.toString())),
    local
  )

  pull(

generic.js

GitHub: regular/gpastats

109
110
111
112
113
114
115
116
117
  lt: [idx, to],
  keys: true,
  values: false,
  seqs: false
}),
pull.map(item=>item.slice(1, item.length - 1)),
aggregate(agg(), reduce( (x,y) => x[1] == y[1])),
//aggregate(aggregate.deltaT(60 * 15), reduce()),
pull.flatten(),

+ 177 other calls in file

public-feed.js

GitHub: DiegoT2k/provasocial

97
98
99
100
101
102
103
104
105
  }
  return false
}),

// MAP ROOT ITEMS
pull.map(item => {
  const root = item.root || item
  return root
}),

+ 5 other calls in file

index.js

GitHub: regular/gpastats

63
64
65
66
67
68
69
70
71
72
  const value = item.seq // TODO
  const rows = makeRows(date, value)
  return rows
}),
pull.flatten(),
pull.map(row=>{
  row = row.replace(/[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12}/, id=>{
    return (suuids[id] || {}).pname || id
  })
  row += '\r\n'

+ 3 other calls in file

Other functions in pull-stream

Sorted by popularity

pull-stream.asyncMap is the most popular function in pull-stream (1458 examples)

Other popular packages:

Home

About