Anthony Robinson

.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

README.md

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-![CF](https://camo.githubusercontent.com/70edab54bba80edb7493cad3135e9606781cbb6b/687474703a2f2f692e696d6775722e636f6d2f377635415363382e706e67) 01: Node Ecosystem
-===
-
-## 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  
-* [Jest Getting Started](https://facebook.github.io/jest/docs/en/getting-started.html)
-* [Jest Globals](https://facebook.github.io/jest/docs/en/api.html#content)
-* [Jest Expect](https://facebook.github.io/jest/docs/en/expect.html#content)
-
-## Configuration 
-Configure the root of your repository with the following files and directories. Thoughfully name and organize any aditional configuration or module files.
-* **README.md** - contains documentation
-* **.gitignore** - contains a [robust](http://gitignore.io) `.gitignore` file 
-* **.eslintrc** - contains the course linter configuratoin
-* **.eslintignore** - contains the course linter ignore configuration
-* **lib/** - contains module definitions
-* **__test__/** - contains unit tests
-
-## Feature Tasks
-#### Greet Module
-Create a NodeJS module in the lib/ directory named `greet.js` that exports a single function. 
-* The `greet` function should have a single parameter (arity of one) that should expect a string as it's input
-* The `greet` function should return the input name, concatenated with "hello ": eg. ("hello susan")
-* The `greet` function should return `null` if the input is not a string
-
-#### Arithmetic Module
-Create a NodeJS module in the lib/ directory named `arithmetic.js` that exports an object. This module should have `add` and `sub` methods that implament addition and subtraction.  
-* The `add` method should have an arity of two (define two paramiters)
-  * If either parameter is a non-number the function should return null
-  * Else return the sum of the 2 numbers
-* The `sub` method should have an arity of two (define two paramiters)
-  * If either parameter is a non-number the function should return null
-  * Else return the second paramiter subtracted from the first paramiter
-
-## Testing  
-#### Greet Module Tests
-* Write a test that expects the greet module to return `null` when you supply non string values
-* Write a test the expects the greet module to return `'hello world'`
-  * This should happen when invoked with `'world'` as the first argument
-
-#### Arithmetic Module Tests
-* Test each method for proper use (invoded with number arguments)
-* Test each method for inproper use (invoded with one or more non-numner arguments)
-
-## Documentation  
-In your README.md describe the exported values of each module defined in your lib/ directory. Every function description should include it's airty (expected number of paramiters), the expected data for each paramiter (data-type and limitations), and it's behavior (for both valid and invalued use). Feel free to write any additional information in your README.md.
+<h1> Arithmetic Methods </h1>
+In this function we have 2 methods with 2 airtys each, add and sub.
+add takes in two integers, adds them and returns the sum.
+sub takes in two integers, subtracts them and returns the sum.
+if the input value for either method is anything other than an integer it returns null.
+
+<h1> Greet Method </h1>
+In this function we have 1 method with 1 airty.
+This function takes in a string and concatinates it after hello.
+if anything other than a string is entered the returned value is null.

__test__/arithmetic.test.js

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+'use strict'
+
+const arithmetic = require('../lib/arithmetic.js');
+
+test('add() should return 2', () => {
+  let result = arithmetic.add(1, 1)
+  expect(result).toEqual(2)
+});
+
+test('add() should return null', () => {
+  let result = arithmetic.add()
+  expect(result).toEqual(null)
+});
+
+test('add() should return 2', () => {
+  let result = arithmetic.sub(1, 1)
+  expect(result).toEqual(0)
+});
+
+test('add() should return null', () => {
+  let result = arithmetic.sub()
+  expect(result).toEqual(null)
+});

__test__/greet.test.js

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+'use strict'
+
+const greet = require('../lib/greet.js');
+
+test('greet() should return "hello Anthony"', () => {
+  let result = greet('Anthony')
+  expect(result).toEqual('hello Anthony')
+  console.log('anthony');
+});
+
+est('greet() should return "hello World"', () => {
+  let result = greet('World')
+  expect(result).toEqual('hello World')
+  console.log('anthony');
+});
+
+test('greet() should return null', () => {
+  let result = greet()
+  expect(result).toEqual(null)
+  console.log('null');
+});
+
+test('greet() should return null', () => {
+  let result = greet(123)
+  expect(result).toEqual(null)
+  console.log('number');
+});

lib/arithmetic.js

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+'use strict'
+
+module.exports = {
+  add: function(a,b){
+    if(typeof a !== 'number' || typeof b !== 'number'){
+        return null;
+      } else {
+        return a + b;
+      }
+  },
+    sub: function(a,b){
+    if(typeof a !== 'number' || typeof b !== 'number'){
+        return null;
+      } else {
+        return a -  b;
+      }
+  }
+};

lib/greet.js

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+'use strict'
+
+module.exports = function(name){
+  if(typeof name === 'string'){
+    return `hello ${name}`
+  } else {
+    return null
+  }
+}