diff --git a/lab-ron/.eslintignore b/lab-ron/.eslintignore
new file mode 100644
index 0000000..4b63a5d
--- /dev/null
+++ b/lab-ron/.eslintignore
@@ -0,0 +1 @@
+**/*/vendor/
diff --git a/lab-ron/.eslintrc b/lab-ron/.eslintrc
new file mode 100644
index 0000000..90447e4
--- /dev/null
+++ b/lab-ron/.eslintrc
@@ -0,0 +1,35 @@
+{
+  "globals" : {
+    "rawData": true,
+    "app": true,
+    "Handlebars": true,
+    "page": true,
+    "$": true,
+    "marked": true,
+    "hljs": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "ecmaFeatures": {"impliedStrict": true}
+  },
+  "env": {
+    "browser": true,
+    "jquery": true,
+    "node": true,
+    "es6": true
+  },
+  "rules": {
+    "semi": [2, "always"],
+    "eqeqeq": ["error", "always"],
+    "no-template-curly-in-string": "error",
+    "no-console": "off",
+    "no-undefined": "off",
+    "indent": ["error", 2],
+    "quotes": ["warn", "single", {"allowTemplateLiterals": true}],
+    "no-multi-spaces": ["warn", {"exceptions": { "VariableDeclarator": true }}],
+    "no-trailing-spaces": "warn",
+    "new-cap": "warn",
+    "no-redeclare": ["error", { "builtinGlobals": true }]
+  }
+}
diff --git a/lab-ron/.gitignore b/lab-ron/.gitignore
new file mode 100644
index 0000000..3583e8a
--- /dev/null
+++ b/lab-ron/.gitignore
@@ -0,0 +1,68 @@
+# Created by https://www.gitignore.io/api/osx,linux,node,vim
+
+### OSX ###
+.DS_Store
+.AppleDouble
+.LSOverride
+
+### 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-*
+
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules
+jspm_packages
+
+# Optional npm cache directory
+.npm
+
+# Optional REPL history
+.node_repl_history
+
+### Vim ###
+# swap
+[._]*.s[a-w][a-z]
+[._]s[a-w][a-z]
+# session
+Session.vim
+# temporary
+.netrwhist
+*~
+
+# auto-generated tag files
+tags
+
+###### Personal
+.tern-project
diff --git a/lab-ron/README.md b/lab-ron/README.md
new file mode 100644
index 0000000..41079ea
--- /dev/null
+++ b/lab-ron/README.md
@@ -0,0 +1,44 @@
+# 01 Node Ecosystem
+
+Greet and Arithmetic are functions that facilitate adding or subtracting two numbers or greeting someone.
+
+## how to use
+
+Please remember to require `greet` and `arithmetic` from the `lib/` directory at the top of your `index.js`
+
+### greet()
+- takes in an argument as a string, and returns `hello + <string>`
+- if argument is not a string or null it will return `null`
+
+```
+console.log(greet('world'));
+console.log(greet(6));
+
+>> hello world
+>> null
+```
+
+
+### arithmetic.add()
+- takes in only two numbers as it's arguments and returns the sum of the numbers
+- if any argument is not a number it will return `null`
+
+```
+console.log(arithmetic.add(2, 3));
+console.log(arithmetic.add('2', '3'));
+
+>> 5
+>> null
+```
+
+### arithmetic.sub()
+- takes in only two numbers as it's arguments and returns the difference of the numbers
+- if any argument is not a number it will return `null`
+
+```
+console.log(arithmetic.sub(9, 3));
+console.log(arithmetic.sub('9', '3'));
+
+>> 6
+>> null
+```
\ No newline at end of file
diff --git a/lab-ron/__test__/arithmetic.test.js b/lab-ron/__test__/arithmetic.test.js
new file mode 100644
index 0000000..cca8595
--- /dev/null
+++ b/lab-ron/__test__/arithmetic.test.js
@@ -0,0 +1,35 @@
+'use strict';
+
+const arithmetic = require('../lib/arithmetic.js');
+
+// arithmetic.add()
+test('arithmetic.add(5, 3) should return 8', () => {
+  let result = arithmetic.add(5, 3);
+  expect(result).toEqual(8);
+});
+
+test('arithmetic.add(5, "3") should return null', () => {
+  let result = arithmetic.add(5, '3');
+  expect(result).toEqual(null);
+});
+
+test('arithmetic.add("5", 3) should return null', () => {
+  let result = arithmetic.add('5', 3);
+  expect(result).toEqual(null);
+});
+
+// arithmetic.sub()
+test('arithmetic.sub(5, 3) should return 2', () => {
+  let result = arithmetic.sub(5, 3);
+  expect(result).toEqual(2);
+});
+
+test('arithmetic.sub(5, "3") should return null', () => {
+  let result = arithmetic.sub(5, '3');
+  expect(result).toEqual(null);
+});
+
+test('arithmetic.sub("5", 3) should return null', () => {
+  let result = arithmetic.sub('5', 3);
+  expect(result).toEqual(null);
+});
\ No newline at end of file
diff --git a/lab-ron/__test__/greet.test.js b/lab-ron/__test__/greet.test.js
new file mode 100644
index 0000000..8a7a5fb
--- /dev/null
+++ b/lab-ron/__test__/greet.test.js
@@ -0,0 +1,19 @@
+'use strict';
+
+const greet = require('../lib/greet.js');
+
+test('greet() should return null', () => {
+  let result = greet();
+  expect(result).toEqual(null);
+});
+
+test('greet(6) should return null', () => {
+  let result = greet(6);
+  expect(result).toEqual(null);
+});
+
+test('greet(\'ron\') should return "hello ron"', () => {
+  let result = greet('ron');
+  expect(result).toEqual('hello ron');
+});
+
diff --git a/lab-ron/index.js b/lab-ron/index.js
new file mode 100644
index 0000000..7a8428d
--- /dev/null
+++ b/lab-ron/index.js
@@ -0,0 +1,15 @@
+'use strict';
+
+const greet = require('./lib/greet.js');
+const arithmetic = require('./lib/arithmetic.js');
+
+console.log(greet());
+console.log(greet('ron'));
+
+console.log(arithmetic.add(1,2));
+console.log(arithmetic.sub(1,2));
+
+console.log(arithmetic.add(1,'2'));
+console.log(arithmetic.sub('1',2));
+
+
diff --git a/lab-ron/lib/arithmetic.js b/lab-ron/lib/arithmetic.js
new file mode 100644
index 0000000..d03f285
--- /dev/null
+++ b/lab-ron/lib/arithmetic.js
@@ -0,0 +1,20 @@
+'use strict';
+
+const arithmetic = {};
+
+arithmetic.add = (a, b) => {
+  if (typeof a === 'number' && typeof b === 'number')
+    return a + b;
+  else
+    return null;
+};
+
+
+arithmetic.sub = (a, b) => {
+  if (typeof a === 'number' && typeof b === 'number')
+    return a - b;
+  else
+    return null;
+};
+
+module.exports = arithmetic;
\ No newline at end of file
diff --git a/lab-ron/lib/greet.js b/lab-ron/lib/greet.js
new file mode 100644
index 0000000..1e59aaf
--- /dev/null
+++ b/lab-ron/lib/greet.js
@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports = (name) => {
+  if (typeof name === 'string')
+    return `hello ${name}`;
+  else
+    return null;
+};
\ No newline at end of file
diff --git a/lab-ron/package.json b/lab-ron/package.json
new file mode 100644
index 0000000..6550679
--- /dev/null
+++ b/lab-ron/package.json
@@ -0,0 +1,23 @@
+{
+  "name": "01-node-ecosystem",
+  "version": "1.0.0",
+  "description": "First lab of 401",
+  "main": "index.js",
+  "dependencies": {
+    "jest": "^21.0.2"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "jest --runInBand"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/ronbarrantes/01-node-ecosystem.git"
+  },
+  "author": "Ron Barrantes",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/ronbarrantes/01-node-ecosystem/issues"
+  },
+  "homepage": "https://github.com/ronbarrantes/01-node-ecosystem#readme"
+}