diff --git a/lab-ron/.eslintignore b/lab-ron/.eslintignore
new file mode 100644
index 0000000..05b1cf3
--- /dev/null
+++ b/lab-ron/.eslintignore
@@ -0,0 +1,5 @@
+**/node_modules/*
+**/vendor/*
+**/*.min.js
+**/coverage/*
+**/build/*
diff --git a/lab-ron/.eslintrc.json b/lab-ron/.eslintrc.json
new file mode 100644
index 0000000..840d336
--- /dev/null
+++ b/lab-ron/.eslintrc.json
@@ -0,0 +1,26 @@
+{
+  "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" ]
+  }
+}
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..c8a28e1
--- /dev/null
+++ b/lab-ron/README.md
@@ -0,0 +1,21 @@
+# Parallel File Processing
+
+Class 3 of 401
+
+### reader()
+`reader()` is used to read the content of multiple files. 
+reader takes in two parameters, an array of paths, and a callback function e.g. `reader(path,callback)` 
+
+```
+reader(['foo.txt', 'bar.txt, 'wic.txt'], (err, data) => {
+  if (err) return console.error(err);
+  console.log(data);
+});
+
+>> foo
+>>
+>> bar
+>>
+>> wic
+>>
+```
\ No newline at end of file
diff --git a/lab-ron/__test__/reader.test.js b/lab-ron/__test__/reader.test.js
new file mode 100644
index 0000000..d212abe
--- /dev/null
+++ b/lab-ron/__test__/reader.test.js
@@ -0,0 +1,34 @@
+'use strict';
+
+const reader = require('../lib/reader.js');
+
+describe('#reader', () => {
+  test(`invalid path should reject an error`, (done) => {
+    reader([`${__dirname}/../assets/foo2.txt`], (err, data) => {
+      expect(err).not.toBeNull();
+      expect(data).toBeUndefined();
+      done();
+    });
+  });
+
+  test(`valid path resolves a maped array of the file data`, (done) => {
+    reader([`${__dirname}/../assets/foo.txt`], (err, data) => {
+      expect(err).toBeNull();
+      expect(data).toEqual(['foo\n']);
+      console.log(data);
+      done();
+    });
+  });
+
+  test(`valid path resolves in the path's name two value`, (done) => {
+    reader([`${__dirname}/../assets/foo.txt`, `${__dirname}/../assets/bar.txt`],
+      (err, data) => {
+        console.log(data);
+        expect(err).toBeNull();
+        expect(data).toEqual(['foo\n', 'bar\n']);
+        done();
+      });
+  });
+
+});
+
diff --git a/lab-ron/assets/bar.txt b/lab-ron/assets/bar.txt
new file mode 100644
index 0000000..5716ca5
--- /dev/null
+++ b/lab-ron/assets/bar.txt
@@ -0,0 +1 @@
+bar
diff --git a/lab-ron/assets/bye.txt b/lab-ron/assets/bye.txt
new file mode 100644
index 0000000..b023018
--- /dev/null
+++ b/lab-ron/assets/bye.txt
@@ -0,0 +1 @@
+bye
diff --git a/lab-ron/assets/foo.txt b/lab-ron/assets/foo.txt
new file mode 100644
index 0000000..257cc56
--- /dev/null
+++ b/lab-ron/assets/foo.txt
@@ -0,0 +1 @@
+foo
diff --git a/lab-ron/assets/hi.txt b/lab-ron/assets/hi.txt
new file mode 100644
index 0000000..45b983b
--- /dev/null
+++ b/lab-ron/assets/hi.txt
@@ -0,0 +1 @@
+hi
diff --git a/lab-ron/index.js b/lab-ron/index.js
new file mode 100644
index 0000000..1fb8681
--- /dev/null
+++ b/lab-ron/index.js
@@ -0,0 +1,9 @@
+'use strict';
+
+const reader = require('./lib/reader');
+
+reader(process.argv.slice(2), (err, data) => {
+  if (err) 
+    return console.log('USAGE ERROR: something went wrong');
+  console.log(data.join('\n'));
+});
\ No newline at end of file
diff --git a/lab-ron/lib/reader.js b/lab-ron/lib/reader.js
new file mode 100644
index 0000000..00fd559
--- /dev/null
+++ b/lab-ron/lib/reader.js
@@ -0,0 +1,23 @@
+'use strict';
+
+const fs = require('fs');
+
+module.exports = (paths, callback) => {
+  console.log(paths);
+  let result = [];
+
+  let loopFiles = (num) => {
+    if (num === paths.length) 
+      return callback(null, result);
+    fs.readFile(paths[num], (err, data) => {
+      if (err) 
+        return callback(err);
+      result.push(data.toString());
+      loopFiles(num + 1);
+    });
+  };
+
+  loopFiles(0);
+};  
+
+
diff --git a/lab-ron/package.json b/lab-ron/package.json
new file mode 100644
index 0000000..5409ebf
--- /dev/null
+++ b/lab-ron/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "lab-ron",
+  "version": "0.0.1",
+  "description": "Lab 3 of 401",
+  "main": "index.js",
+  "dependencies": {},
+  "devDependencies": {
+    "eslint": "^4.6.1",
+    "jest": "^21.0.2"
+  },
+  "scripts": {
+    "lint": "eslint .",
+    "test": "jest --coverage -i",
+    "test-watch": "jest --watch -i"
+  },
+  "keywords": [],
+  "author": "Ron Barrantes",
+  "license": "MIT"
+}