diff --git a/staff/david-aroca/.gitignore b/staff/david-aroca/.gitignore
new file mode 100644
index 000000000..496ee2ca6
--- /dev/null
+++ b/staff/david-aroca/.gitignore
@@ -0,0 +1 @@
+.DS_Store
\ No newline at end of file
diff --git a/staff/david-aroca/Carray/Carray.1.js b/staff/david-aroca/Carray/Carray.1.js
new file mode 100644
index 000000000..e69de29bb
diff --git a/staff/david-aroca/Carray/Carray.js b/staff/david-aroca/Carray/Carray.js
new file mode 100644
index 000000000..cbb72e176
--- /dev/null
+++ b/staff/david-aroca/Carray/Carray.js
@@ -0,0 +1,62 @@
+function Carray() {
+    var elements = arguments
+
+    for (var i = 0; i < Carrayarray.length; i++) {
+        var element = element[i];
+
+        this[i] = element
+    }
+    this.length = elements.length
+}
+
+// Carray.prototype.array.forEach(element => {});
+
+Carray.prototype.forEach = function (callback) {
+    for (var i = 0; i < this.length; i++) {
+        var element = this[i];
+
+        callback(element)
+    }
+}
+
+Carray.prototype.find = function (callback) {
+    for (var i = 0; i < this.length; i++) {
+        var element = this[i];
+
+        var matches = callback(element)
+
+        if (matches)
+            return element
+
+    }
+}
+
+Carray.prototype.map = function (callback) {
+    var results = new Carray
+
+    for (var i = 0; i < array.length; i++) {
+        const element = this[i];
+
+        var mappedElemet = callback(element)
+
+        results[results.length] = mappedElemet
+        results.length++
+
+    }
+
+    return results
+}
+
+Carray.prototype.find = Function(callback){
+    var results = new Carray()
+
+    for (var i = 0; i < this.length; i++) {
+        if (callback(this{ i })) {
+
+        }
+
+    }
+    return results
+}
+
+module.exports = Carray
diff --git a/staff/david-aroca/Carray/Carray.test.js b/staff/david-aroca/Carray/Carray.test.js
new file mode 100644
index 000000000..9612e664c
--- /dev/null
+++ b/staff/david-aroca/Carray/Carray.test.js
@@ -0,0 +1,113 @@
+var Carray = require('./Carray')
+
+console.log('TEST Carray')
+
+console.log('> constructor')
+
+console.log('CASE construct an instance without element')
+
+var c = new Carray
+
+console.log(c)
+// Carray (length: 0)
+
+console.log('CASE constructor an instance with number elements')
+
+var c = new Carray(10, 20, 30)
+
+console.log(c)
+//Carray { 0:10, 1: 20, 2: 30, length: 3}
+
+console.log('CASE constructs an instance with string elements')
+
+var c = new Carray('Ana', 'Adrian', 'Javier', 'Sergio', 'Bernar', 'Maite', 'Sara')
+
+console.log(c)
+// Carray {0: 'Ana', 1: 'Adrian, 'Javier', 'Sergio', 'Bernat', 'Maite', 'Sara', length 7
+
+console.log('> forEach')
+
+console.log('CASE  iterates an instance with number elements')
+
+var c = new Carray(10, 20, 30)
+
+c.forEach(function (element) {
+    console.log(element)
+})
+// 10
+// 20
+// 30
+
+console.log('CASE iterates an instance with string to upper-case')
+
+var c = new Carray('Ana', 'Adrian', 'Javier', 'Sergio', 'Bernat', 'Maite', 'Sara')
+
+c.forEach(function (element) {
+    console.log(element.toUpperCase())
+})
+
+// ANA
+// ADRIAN
+// JAVIER
+// SERGIO
+// BERNAT
+// MAITE
+// SARA
+
+console.log('> find')
+
+console.log('CASE find person with age 20')
+
+var people = new Carray(
+    { name: 'Peter', age: 30 },
+    { name: 'Wendy', age: 25 },
+    { name: 'James', age: 20 },
+    { name: 'Campa', age: 15 }
+)
+
+var person = people.find(function (person) {
+    return person.age === 20
+})
+
+console.log(person)
+// { name: 'James', age: 20}
+
+console.log('> map')
+
+console.log('CASE maps products from cart to subtotals')
+
+var cart = new Carray(
+    { name: 'Socks Adidas', price: 20, quantity: 2 },
+    { name: 'Nike Air Max', price: 80, quantity: 1 },
+    { name: 'Shorts Puma', price: 30, quantity: 4 },
+)
+
+var subtotals = cart.map(function () {
+    return product.price * product.quantity
+})
+
+console.log(subtotals)
+//Carray { 0:40, 1:80, 2:90, 3:200, length: 4}
+
+console.log('CASE maps names to upper-case')
+
+var names = new Carray('Ana', 'Adrian', 'Javier', 'Sergio', 'Bernat', 'Maite', 'Sara')
+
+var namesinUpperCase = names.map(function (name) {
+    return name.toUpperCase()
+})
+
+console.log(namesinUpperCase)
+// Carray {0: 'ANA', 1: 'ADRIAN', 2: 'JAVIER', 3 'SERGIO', 4: 'BERNAT', 5: 'MAITE', 6: 'SARA', lentgh: 7}
+
+
+console.log('CASE find the names whith (A)')
+
+var names = new Carray('Ana', 'Adrian', 'Javier', 'Sergio', 'Bernat', 'Maite', 'Sara')
+
+var nanesWithA = names.find(function(name){
+    return name.includes('a')
+})
+
+console.log(namesinUpperCase)
+