Parallel file processing

lab-christina/.eslintignore

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+**/node_modules/*
+**/vendor/*
+**/*.min.js
+**/coverage/*
+**/build/*

lab-christina/.eslintrc.json

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+{
+  "env": {
+    "browser": true,
+    "node": true,
+    "commonjs": true,
+    "mocha": true,
+    "es6": true
+  },
+  "globals": {
+    "err": true,
+    "req": true,
+    "res": true,
+    "next": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "sourceType": "module"
+  },
+  "rules": {
+    "no-console": "off",
+    "indent": [ "error", 2 ],
+    "quotes": ["error", "single", { "allowTemplateLiterals": true }],
+    "comma-dangle": ["error", "always-multiline"],
+    "semi": [ "error", "always" ]
+  }
+}

lab-christina/.gitignore

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+
+# Created by https://www.gitignore.io/api/osx,node,linux,windows
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+
+### OSX ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.gitignore.io/api/osx,node,linux,windows

lab-christina/README.md

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+## 03-asynchronous-callbacks
+### reader.js module
+* Exports a function that loops though an array of filepaths. The function has an arity of two.
+* Using fs readFIle the files are translated from buffer objects to 'utf-8'
+* fs readFile is in error first data last format.
+* If the filepath is undefined you will recieve an error.
+
+### reader.test.js
+
+* In the test file I've created two test.
+* The first test ensures that an error will be returned in an invalid filepath is provided.
+* The second tests purpose is to test the data is returned in a mapped array of strings. I am currently looping through all files and recieved the correct data. I've yet to accomplish mapping the return into an array.

lab-christina/__test__/asset/betcha.txt

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+food

lab-christina/__test__/asset/data.txt

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+for

lab-christina/__test__/asset/lastly.txt

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+words

lab-christina/__test__/reader.test.js

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+'use strict';
+
+const reader = require('../lib/reader.js');
+
+describe('reader', () => {
+  test('an invalid path will result in an error message', (done) => {
+    reader(`${__dirname}/fake`, (err, data) => {
+      expect(data).toBeUndefined();
+      done();
+    });
+  });
+  test('a valid path should resolve in an array of strings', (done) => {
+    reader([`${__dirname}/asset/betcha.txt`,`${__dirname}/asset/data.txt`, `${__dirname}/asset/lastly.txt`], (err, data) => {
+      expect(err).toBeNull();
+      expect(data).toEqual(['words\n', 'for\n', 'food\n']);
+      done();
+    });
+  });
+});

lab-christina/index.js

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+
+const reader = require('./lib/reader');

lab-christina/lib/reader.js

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+'use strict';
+
+const fs = require('fs');
+
+
+module.exports = (filepath, callback) => {
+  let pathArray = [];
+  fs.readFile(filepath[0], 'utf-8', (err, data) => {
+    if (err) {
+      return callback(err);
+    }
+    pathArray[2] = (data);
+    fs.readFile(filepath[1], 'utf-8', (err, data) => {
+      if (err) {
+        return callback(err);
+      }
+      pathArray[1] = (data);
+      fs.readFile(filepath[2], 'utf-8', (err, data) => {
+        if (err) {
+          return callback(err);
+        }
+        pathArray[0] = (data);
+        console.log(pathArray);
+        callback(null, pathArray);
+      });
+    });
+  });
+};

lab-christina/package.json

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+{
+  "name": "lab-christina",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest -i",
+    "test-watch":"test --watch -i"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "jest": "^21.0.2"
+  },
+  "dependencies": {
+    "fs": "0.0.1-security"
+  }
+}