Lab 1 complete

lab-rob/.eslintignore

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

lab-rob/.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-rob/.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

lab-rob/.vscode/settings.json

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+{
+    "cSpell.words": [
+        "advanced",
+        "gitlens",
+        "messages",
+        "monokai",
+        "seti"
+    ]
+}

lab-rob/README.md

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+# Code Fellows: Code 401d19: Full-Stack JavaScript
+## Lab 01: Node Ecosystem
+#### 11/27/17 - Robert Reed
+
+### greet.js
+greet.js exports a single function, creatively called `greet()`. The function has an arity of 1, expecting a single string as its argument.
+
+If a non-string (or no argument) is provided to the function, `null` is returned. 
+
+If a single string is provided as argument, the function returns a concatenated version of the string with `hello <string>`.
+
+If multiple strings are provided, the first string is used.
+
+### arithmetic.js
+arithmetic.js exports an object containing three methods.
+
+#### `arithmetic.areNums(array)`
+`arithmetic.areNums()` has an arity of one, and expects a single array as argument. If a non-array or no argument is given, the method will throw an error. If an array of length 0 is provided, it will return `false`. Otherwise, if the array contains only elements of type `number`, the function will return `true`. If the array contains _any_ non-numbers, the function will return `false`.
+
+#### `arithmetic.add(num1, num2)`
+`arithmetic.add()` has an arity of 2 and expects numbers. If both arguments given are numbers, the function returns their sum. If either or both of the arguments are not a number, the function will return `null`. This method makes use of the `arithmetic.areNums()` method to ensure valid arguments are given. If additional arguments are given, and one of those arguments is not a number, the function will return `null`.
+
+#### `arithmetic.sub(num1, num2)`
+`arithmetic.sub()` has an arity of 2 and expects numbers. If both arguments given are numbers, the function returns their difference, in the form `num1 - num2`. If either or both of the arguments are not a number, the function will return `null`. This method makes use of the `arithmetic.areNums()` method to ensure valid arguments are given. If additional arguments are given, and one of those arguments is not a number, the function will return `null`.

lab-rob/__test__/arithmetic.test.js

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+'use strict';
+
+const arithmetic = require('../lib/arithmetic');
+
+describe('Helper functions should return a boolean.', () => {
+  test('areNums(arry) should return true if all elements in the array are numbers', () => {
+    expect(arithmetic.areNums([1, 2, 3])).toBeTruthy();
+  });
+
+  test('areNums(arry) should return false if any element in the array is not a number, or if the array is empty.', () => {
+    expect(arithmetic.areNums([1, 2, 'hey'])).toBeFalsy();
+    expect(arithmetic.areNums([])).toBeFalsy();
+  });
+});
+
+describe('add(num1, num2) method should take in two numbers and return their sum.', () => {
+  test('If two numbers are given as arguments, add(num1, num2) should return their sum.', () => {
+    expect(arithmetic.add(1, 9)).toBe(10);
+    expect(arithmetic.add(-9, 5.5)).toBeCloseTo(-3.5);
+  });
+
+  test('If either argument is not a number, add(num1, num2) should return null.', () => {
+    expect(arithmetic.add(1, 'a')).toBeNull();
+  });
+});
+
+describe('sub(num1, num2) should take in two numbers and return the first minus the second.', () => {
+  test('If either argument is not a number, sub(num1, num2) should return null.', () => {
+    expect(arithmetic.sub('k', '')).toBeNull();
+    expect(arithmetic.sub(5,'8')).toBeNull();
+  });
+
+  test('sub(num1, num2 should return the difference of the two numbers assuming they are both numbers.', () => {
+    expect(arithmetic.sub(3, 12)).toBe(-9);
+    expect(arithmetic.sub(4.7, 1.8)).toBeCloseTo(2.9);
+  });
+});

lab-rob/__test__/greet.test.js

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+'use strict';
+
+const greet = require('../lib/greet');
+
+describe('Testing functionality for greet.js.', () => {
+  test('When greet(name) is called with a valid string, it should return "hello <name>".', () => {
+    expect(greet('world')).toBe('hello world');
+  });
+
+  test('When greet(name) is called with anything other than a string it should return null.', () => {
+    expect(greet(87)).toBeNull();
+    expect(greet()).toBeNull();
+  });
+});

lab-rob/lib/arithmetic.js

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+'use strict';
+
+const arithmetic = module.exports = {};
+
+arithmetic.areNums = arry => {
+  for(let i = 0; i < arry.length; i++)
+    if(typeof arry[i] !== 'number') return false;
+  return arry.length > 0 ? true : false;
+};
+
+arithmetic.add = function (num1, num2) {
+  return arithmetic.areNums(arguments) ? num1 + num2 : null;
+};
+
+arithmetic.sub = function (num1, num2) {
+  return arithmetic.areNums(arguments) ? num1 - num2 : null;
+};

lab-rob/lib/greet.js

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+'use strict';
+
+module.exports = name => {
+  return name && typeof name === 'string' ? `hello ${name}` : null;
+};