Code files

Chapter03/working-with-files/asynchronous-file-operations/log.txt

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Chapter03/working-with-files/asynchronous-file-operations/null-byte-remover-sync-with-progress-dots.js

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+'use strict'
+
+setInterval(() => process.stdout.write('.'), 10).unref()
+
+const fs = require('fs')
+const path = require('path')
+const cwd = process.cwd()
+const bytes = fs.readFileSync(path.join(cwd, 'file.dat'))
+
+const clean = bytes.filter(n => n)
+fs.writeFileSync(path.join(cwd, 'clean.dat'), clean)
+
+fs.appendFileSync(
+  path.join(cwd, 'log.txt'),
+  (new Date) + ' ' + (bytes.length - clean.length) + ' bytes removed\n'
+)

Chapter03/working-with-files/asynchronous-file-operations/null-byte-remover.js

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+'use strict'
+
+setInterval(() => process.stdout.write('.'), 10).unref()
+
+const fs = require('fs')
+const path = require('path')
+const cwd = process.cwd()
+
+fs.readFile(path.join(cwd, 'file.dat'), (err, bytes) => {
+  if (err) { console.error(err); process.exit(1); }
+  const clean = bytes.filter(n => n)
+  fs.writeFile(path.join(cwd, 'clean.dat'), clean, (err) => {
+    if (err) { console.error(err); process.exit(1); }
+    fs.appendFile(
+      path.join(cwd, 'log.txt'),
+      (new Date) + ' ' + (bytes.length - clean.length) + ' bytes removed\n'
+    )
+  })
+})

Chapter03/working-with-files/incremental-processing/log.txt

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+Wed Jun 08 2016 23:48:13 GMT+0100 (BST) 896977 bytes removed
+Wed Jun 08 2016 23:48:17 GMT+0100 (BST) 896977 bytes removed
+Wed Jun 08 2016 23:49:25 GMT+0100 (BST) 896977 bytes removed
+Wed Jun 08 2016 23:50:17 GMT+0100 (BST) 896977 bytes removed

Chapter03/working-with-files/incremental-processing/null-byte-remover.js

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+'use strict'
+
+setInterval(() => process.stdout.write('.'), 10).unref()
+
+const fs = require('fs')
+const path = require('path')
+const cwd = process.cwd()
+
+const sbs = require('strip-bytes-stream')
+
+fs.createReadStream(path.join(cwd, 'file.dat'))
+  .pipe(sbs((n) => n))
+  .on('end', function () { log(this.total) })
+  .pipe(fs.createWriteStream(path.join(cwd, 'clean.dat')))
+
+function log(total) {
+  fs.appendFile(
+    path.join(cwd, 'log.txt'),
+    (new Date) + ' ' + total + ' bytes removed\n'
+  )
+}
+
+

Chapter03/working-with-files/incremental-processing/package.json

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+{
+  "name": "piping",
+  "version": "1.0.0",
+  "description": "",
+  "main": "null-byte-remover.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "David Mark Clements",
+  "license": "MIT",
+  "dependencies": {
+    "strip-bytes-stream": "^1.1.0"
+  }
+}

Chapter03/working-with-files/log.txt

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+Wed Jun 08 2016 22:59:08 GMT+0100 (BST) 897090 bytes removed

Chapter03/working-with-files/null-byte-remover.js

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+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+const cwd = process.cwd()
+const bytes = fs.readFileSync(path.join(cwd, 'file.dat'))
+
+const clean = bytes.filter(n => n)
+fs.writeFileSync(path.join(cwd, 'clean.dat'), clean)
+
+fs.appendFileSync(
+  path.join(cwd, 'log.txt'),
+  (new Date) + ' ' + (bytes.length - clean.length) + ' bytes removed\n'
+)
+