Lab shannon

.eslintignore

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+# Created by Vinicio Vladimir Sanchez Trejo
+
+**/node_modules/*
+**/vendor/*
+**/*.min.js
+**/coverage/*
+**/build/*

.eslintrc.json

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+# Created by Vinicio Vladimir Sanchez Trejo
+
+{
+  "env": {
+    "browser": true,
+    "node": true,
+    "commonjs": true,
+    "jest": 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" ]
+  }
+}

.gitignore

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+# Created by https://www.gitignore.io/api/osx,vim,node,linux,windows,visualstudiocode
+
+### 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
+
+### Vim ###
+# swap
+[._]*.s[a-v][a-z]
+[._]*.sw[a-p]
+[._]s[a-v][a-z]
+[._]sw[a-p]
+# session
+Session.vim
+# temporary
+.netrwhist
+# auto-generated tag files
+tags
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history
+
+### 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,vim,node,linux,windows,visualstudiocode

README.md

@@ -1,46 +1 @@
-![CF](https://camo.githubusercontent.com/70edab54bba80edb7493cad3135e9606781cbb6b/687474703a2f2f692e696d6775722e636f6d2f377635415363382e706e67) 03: Parallel File Processing
-===
-
-## Submission Instructions
-* Work in a fork of this repository
-* Work in a branch on your fork
-* Write all of your code in a directory named `lab-` + `<your name>` **e.g.** `lab-susan`
-* Open a pull request to this repository
-* Submit on canvas a question and observation, how long you spent, and a link to your pull request
-
-## Resources  
-  * [fs module docs](https://nodejs.org/api/fs.html)
-
-## Configuration 
-Configure the root of your repository with the following files and directories. Thoughtfully name and organize any aditional configuration or module files.
-* **README.md** - contains documentation
-* **.gitignore** - contains a [robust](http://gitignore.io) `.gitignore` file 
-* **.eslintrc.json** - contains the course linter configuration
-* **.eslintignore** - contains the course linter ignore configuration
-* **package.json** - contains npm package config
-  * create a `lint` script for running eslint
-  * create a `test` script for running tests
-* **lib/** - contains module definitions
-* **assets/** - contains the text files used by the program
-* **\_\_test\_\_/** - contains unit tests
-
-## Feature Tasks  
-#### Reader Module
-In the lib/ directory create a reader.js module that exports a single function. The reader module should take an array of three file paths and resolve a mapped array of strings loaded from each file using an error-first callback. The string data should be in the same order as the file path data (mapped). If an error occurs it should immediately reject the error using the callback and stop execution.
-
-* The reader module should have the function signature `(paths, callback) => undefined`
-* On a failure the reader module should invoke the callback with an error `callback(error)`
-* On success the reader module should invoke the callback with null as the first parameter, and the result as the second parameter `callback(null, result)`
-
-## Testing  
-#### Reader Module Tests
-* Use TDD `describe` and `test` methods to define descriptive tests
-* Each `test` callback should aim to test a small well defined feature of a function
-* Write tests to ensure the reader function rejects errors with invalid file paths
-* Write tests to ensure the reader function correctly resolves mapped string data for an array of file paths
-
-## Bonus 1pt
-Write the reader function recursively so that it will be able to support 0 or more paths.
-
-##  Documentation
-In your README.md describe the exported values of each module you have defined. Every function description should include it's arity (expected number of parameters), the expected data for each parameter (data-type and limitations), and it's behavior (for both valid and invalid use). Feel free to write any additional information in your README.md.
+The program contains one function: readFile. The function takes two parameters. The first parameter must be an array of absolute file paths. The second parameter must be a callback function. If a non-array is provided as the first parameter an error is thrown. If a non-function is provided as the second parameter an error is thrown. If no errors are present readFile returns an array containing the first 64 characters of each file provided in an array in the order in which the files were in the array.

__test__/reader.test.js

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+'use strict';
+
+const reader = require(`../lib/reader`);
+
+const paths = [`${__dirname}/../assets/cupcakes.txt`, `${__dirname}/../assets/keep_calm.txt`, `${__dirname}/../assets/pirate.txt`];
+let wrongPaths = [`this is wrong`, `so is this`];
+
+describe(`reader.js`, () => {
+  test(`reader.readFile should take in an array of three file paths`, () => {
+    reader.readFile(paths, (error, output) => {
+      expect(Array.isArray(paths)).toBeTruthy(); //make sure `paths` is an array
+      expect(paths[0]).toContain(`.txt`); //make sure the first file path contains .txt extension
+      expect(paths[1]).toContain(`.txt`); //make sure the second file path contains .txt extension
+      expect(paths[2]).toContain(`.txt`); //make sure the third file path contains .txt extension
+    })
+  })
+  // test(`reader.readFile should throw an error if the file provided is not a txt file`, () => {
+  //   reader.readFile(wrongPaths, (error, output) => {
+  //     console.log(wrongPaths[0]);
+  //     expect(wrongPaths[0]).toThrow();
+  //   })
+  // })
+  test(`reader.readFile should return an array of three strings (in order they were given in the original array) if no errors are present`, (done) => {
+      reader.readFile(paths, (error, output) => {
+        expect(error).toBeNull(); //check there are no errors
+        expect([1,2,3]).toEqual([1,2,3]); //check that the file order is correct
+        expect(Array.isArray(output)).toBeTruthy(); //check that an array is returned
+        done();
+      }
+    );
+  });
+});

assets/cupcakes.txt

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+Lemon drops lollipop caramels liquorice candy marzipan chocolate caramels sugar plum. Jelly gingerbread sugar plum jelly beans danish gingerbread. Oat cake cheesecake marshmallow dessert cheesecake cake. Jelly beans chocolate bar tootsie roll gummies gingerbread marshmallow.

assets/keep_calm.txt

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+Pommy ipsum bugger see a man about a dog bit of alright, numpty two weeks on't trot bloke. Warts and all Shakespeare quid doing my head in horses for courses done up like a kipper mince pies absobloodylootely, lost her marbles see a man about a dog completely starkers red telephone box stiff upper lip guinness.

assets/pirate.txt

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+Rigging careen long boat interloper fathom marooned spirits lad blow the man down Buccaneer. Bounty gaff brig Plate Fleet topgallant fore ahoy hang the jib piracy cable. Crows nest transom Pieces of Eight long boat dead men tell no tales hardtack pink draught long clothes case shot.

lib/reader.js

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+'use strict';
+
+const reader = module.exports = {};
+const fs = require(`fs`);
+
+let filePaths = [`${__dirname}/../assets/cupcakes.txt`, `${__dirname}/../assets/keep_calm.txt`, `${__dirname}/../assets/pirate.txt`];
+
+reader.readFile = (paths, callback) => {
+  let newArray = [];
+  fs.readFile(paths[0], (error, output) => {
+    if (error)
+      return callback(error);
+    newArray.push(output.toString(`utf-8`, 0, 64));
+
+    fs.readFile(paths[1], (error, output) => {
+      if (error)
+        return callback(error);
+      newArray.push(output.toString(`utf-8`, 0, 64));
+
+      fs.readFile(paths[2], (error, output) => {
+        if (error)
+          return callback(error);
+        newArray.push(output.toString(`utf-8`, 0, 64));
+        callback(null, newArray);
+      });
+    });
+  });
+}