Code files

Chapter04/creating-readable-writable-streams/composing-duplex-streams/index.js

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+'use strict'
+
+const from = require('from2')
+const to = require('to2')
+const duplexify = require('duplexify')
+
+const rs = from(() => {
+  rs.push(Buffer.from('Hello, World!'))
+  rs.push(null)
+})
+
+const ws = to((data, enc, cb) => {
+  console.log(`Data written: ${data.toString()}`)
+  cb()
+})
+
+const stream = duplexify(ws, rs)
+
+stream.pipe(stream)

Chapter04/creating-readable-writable-streams/composing-duplex-streams/package.json

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+{
+  "name": "composing-duplex-streams",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "from2": "^2.3.0",
+    "to2": "^1.0.0"
+  }
+}

Chapter04/creating-readable-writable-streams/core-streams/index.js

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+'use strict'
+
+const { Readable, Writable } = require('readable-stream')
+
+const rs = Readable({
+  read: () => {
+    rs.push(Buffer.from('Hello, World!'))
+    rs.push(null) 
+  }
+})
+
+const ws = Writable({
+  write: (data, enc, cb) => {
+    console.log(`Data written: ${data.toString()}`)
+    cb()
+  }
+})
+
+rs.pipe(ws)

Chapter04/creating-readable-writable-streams/from2-to2-streams/index.js

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+'use strict'
+
+const from = require('from2')
+const to = require('to2')
+
+const rs = from(() => {
+  rs.push(Buffer.from('Hello, World!'))
+  rs.push(null) 
+})
+
+// rs.on('data', (data) => {
+//   console.log(data.toString()) 
+// })
+
+const ws = to((data, enc, cb) => {
+  console.log(`Data written: ${data.toString()}`)
+  cb()
+})
+
+rs.pipe(ws)

Chapter04/creating-readable-writable-streams/from2-to2-streams/package.json

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+{
+  "name": "from2-to2-streams",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "from2": "^2.3.0",
+    "to2": "^1.0.0"
+  }
+}

Chapter04/creating-readable-writable-streams/readable-flow-control/expected-behavior.js

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+'use strict'
+
+const from = require('from2')
+const rs = from((size, cb) => {
+  setTimeout(() => {
+    rs.push('Data 0')
+    setTimeout(() => {
+      rs.push('Data 1')
+      cb()
+    }, 50)
+  }, 100)
+})
+
+rs.on('data', (data) => {
+  console.log(data.toString())
+})

Chapter04/creating-readable-writable-streams/readable-flow-control/package.json

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+{
+  "name": "readable-flow-control",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "from2": "^2.3.0",
+    "readable-stream": "^2.2.6"
+  }
+}

Chapter04/creating-readable-writable-streams/readable-flow-control/undefined-behavior.js

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+'use strict'
+
+// WARNING: DOES NOT WORK AS EXPECTED
+const { Readable } = require('readable-stream')
+const rs = Readable({
+  read: () => {
+    setTimeout(() => {
+      rs.push('Data 0')
+      setTimeout(() => {
+        rs.push('Data 1')
+      }, 50)
+    }, 100)
+  }
+})
+
+rs.on('data', (data) => {
+  console.log(data.toString())
+})