diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 0000000..e69de29
diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1 @@
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4ec7bce
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,127 @@
+# 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
diff --git a/README.md b/README.md
index 328a88c..bf59c93 100644
--- a/README.md
+++ b/README.md
@@ -1,52 +1,21 @@
 ![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
+## Exported Values
 #### 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
+Exports a single function
+* The `greet` function has an arity of one
+* The data type for this parameter is string
+* If the parameter is a string, the `greet` function returns the parameter concatenated with `'hello '`, for example `hello katherine`
+* Else the `greet` function returns `null`
 
 #### 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.
+Exports an object. This module has `add` and `sub` methods that implement addition and subtraction
+* The `add` method has an arity of two
+  * The data type for these parameters is number
+  * If both parameters are numbers, the function returns the two numbers' sum, for example `5` for `(2,3)`
+  * Else the function returns `null`
+* The `sub` method has an arity of two
+  * The data type for these parameters is number
+  * If both parameters are numbers, the function returns the difference of the second parameter subtracted from the first parameter, for example `-1` for `(2,3)`
+  * Else the function returns `null`
diff --git a/__test__/arithmetic.test.js b/__test__/arithmetic.test.js
new file mode 100644
index 0000000..0e311be
--- /dev/null
+++ b/__test__/arithmetic.test.js
@@ -0,0 +1,33 @@
+'use strict';
+
+const arithmetic = require('../lib/arithmetic.js');
+
+test('arithmetic.add() should return null', () => {
+  let result = arithmetic.add();
+  expect(result).toEqual(null);
+});
+
+test('arithmetic.sub() should return null', () => {
+  let result = arithmetic.sub();
+  expect(result).toEqual(null);
+});
+
+test('arithmetic.add(2,\'hi\') should return null', () => {
+  let result = arithmetic.add(2,'hi');
+  expect(result).toEqual(null);
+});
+
+test('arithmetic.sub(2,\'hi\') should return null', () => {
+  let result = arithmetic.add(2,'hi');
+  expect(result).toEqual(null);
+});
+
+test('arithmetic.add(2,3) should return 5', () => {
+  let result = arithmetic.add(2,3);
+  expect(result).toEqual(5);
+});
+
+test('arithmetic.sub(2,3) should return -1', () => {
+  let result = arithmetic.sub(2,3);
+  expect(result).toEqual(-1);
+});
diff --git a/__test__/greet.test.js b/__test__/greet.test.js
new file mode 100644
index 0000000..c82fb9f
--- /dev/null
+++ b/__test__/greet.test.js
@@ -0,0 +1,18 @@
+'use strict';
+
+const greet = require('../lib/greet.js');
+
+test('greet() should return null', () => {
+  let result = greet();
+  expect(result).toEqual(null);
+});
+
+test('greet(3) should return null', () => {
+  let result = greet(3);
+  expect(result).toEqual(null);
+});
+
+test('greet(\'world\') should return "hello world"', () => {
+  let result = greet('world');
+  expect(result).toEqual('hello world');
+});
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..717fd51
--- /dev/null
+++ b/index.js
@@ -0,0 +1,7 @@
+'use strict';
+
+// assign to name of file you're referring to
+
+const greet = require('./lib/greet.js');
+
+const arithmetic = require('./lib/arithmetic.js');
diff --git a/lib/arithmetic.js b/lib/arithmetic.js
new file mode 100644
index 0000000..4a88464
--- /dev/null
+++ b/lib/arithmetic.js
@@ -0,0 +1,22 @@
+'use strict';
+
+// Export an object that has add and sub methods that implement addition and subtraction
+
+module.exports = {
+  add: (num1,num2) => {
+    if(typeof num1 === 'number' && typeof num2 === 'number'){
+      return num1 + num2;
+    }
+    else {
+      return null;
+    }
+  },
+  sub: (num1,num2) => {
+    if(typeof num1 === 'number' && typeof num2 === 'number'){
+      return num1 - num2;
+    }
+    else {
+      return null;
+    }
+  }
+};
diff --git a/lib/greet.js b/lib/greet.js
new file mode 100644
index 0000000..26b553b
--- /dev/null
+++ b/lib/greet.js
@@ -0,0 +1,12 @@
+'use strict';
+
+// Export a function that takes in a name and returns "hello" + name
+
+module.exports = name => {
+  if(typeof name === 'string') {
+    return `hello ${name}`;
+  }
+  else {
+    return null;
+  }
+};
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..b312844
--- /dev/null
+++ b/package.json
@@ -0,0 +1,26 @@
+{
+  "name": "01-node-ecosystem",
+  "version": "1.0.0",
+  "description": "01-node-ecosystem lab",
+  "main": "index.js",
+  "directories": {
+    "lib": "lib"
+  },
+  "scripts": {
+    "test": "jest --runInBand"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/KatherineHanson/01-node-ecosystem.git"
+  },
+  "author": "Katherine Hanson",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/KatherineHanson/01-node-ecosystem/issues"
+  },
+  "homepage": "https://github.com/KatherineHanson/01-node-ecosystem#readme",
+  "devDependencies": {},
+  "dependencies": {
+  "jest": "^21.0.2"
+  }
+}