Mark

lab-mark/.eslintignore

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

lab-mark/.eslintrc.json

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+{
+  "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" ]
+  }
+}

lab-mark/.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-mark/README.md

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+![CF](https://camo.githubusercontent.com/70edab54bba80edb7493cad3135e9606781cbb6b/687474703a2f2f692e696d6775722e636f6d2f377635415363382e706e67) Code-401-Javascript Lab-2
+===
+This is day 3 of lab with Code Fellows and it teaches students the fundamentals of asynchronous call backs utilizing the FS module in Node.
+# Modules
+Description of exported values of each module defined in lib/ directory, along with arity and expected input/return values.
+### reader.js
+Exports a single function that takes an array of n file paths and resolves a mapped array of strings loaded from each file using an error-first callback.
+
+* The reader function has an arity of 3.
+* The first parameter expects an array of paths.
+* The second parameter expects a callback function used to signal the recursion process is done.
+* The third parameter takes in the populated array during recursion.

lab-mark/__test__/reader.test.js

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+'use strict';
+
+const reader = require('../lib/reader.js');
+
+const testData = [
+  `${__dirname}/../assets/test1.txt`,
+  `${__dirname}/../assets/test2.txt`,
+  `${__dirname}/../assets/test3.txt`,
+  `${__dirname}/../assets/test4.txt`,
+  `${__dirname}/../assets/test5.txt`,
+];
+
+describe('#reader', () => {
+  test('an invalid path should reject an error', (done) => {
+    reader([`${__dirname}/../assets/Invalid-Lol.txt`], (err, data) => {
+      expect(err).not.toBeNull();
+      expect(data).toBeUndefined();
+      done();
+    });
+  });
+
+  test('a valid single path in an array should return the string of the text in an array', (done) => {
+    reader([`${__dirname}/../assets/test1.txt`], (err, data) => {
+      expect(err).toBeNull();
+      expect(data).toEqual(['This is test one.\n']);
+      done();
+    });
+  });
+  test('A valid array of file paths should return mapped array string data', (done) => {
+    reader(testData, (err, data) => {
+      expect(err).toBeNull();
+      expect(data).toEqual(['This is test one.\n','This is test two.\n','This is test three.\n','This is test four.\n','I bet you thought this would say this is test 5..... hah!\n']);
+      done();
+    });
+  });
+});

lab-mark/assets/test1.txt

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+This is test one.

lab-mark/assets/test2.txt

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+This is test two.

lab-mark/assets/test3.txt

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+This is test three.

lab-mark/assets/test4.txt

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+This is test four.

lab-mark/assets/test5.txt

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+I bet you thought this would say this is test 5..... hah!

lab-mark/lib/reader.js

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+'use strict';
+
+const fs = require('fs');
+
+module.exports = (path, callback, returnData) => {
+
+  if(!returnData)
+    returnData = [];
+
+  // No more paths... tell tests that it's done.
+  if (path.length === 0) {
+    callback(null, returnData);
+  }
+
+  // More paths... call yoself
+  else {
+    fs.readFile(path[0], (err, data) => {
+      if(err)
+        return callback(err);
+
+      returnData.push(data.toString());
+      module.exports(path.slice(1), callback, returnData);
+    });
+  }
+};