diff --git a/05_Day_Arrays/05_day_starter/data/countries.js b/05_Day_Arrays/05_day_starter/data/countries.js
index e57b005..f7a1a66 100644
--- a/05_Day_Arrays/05_day_starter/data/countries.js
+++ b/05_Day_Arrays/05_day_starter/data/countries.js
@@ -1,4 +1,5 @@
const countries = [
+
'Afghanistan',
'Albania',
'Algeria',
diff --git a/05_Day_Arrays/05_day_starter/index.html b/05_Day_Arrays/05_day_starter/index.html
index 7d8eeea..40dbaf9 100644
--- a/05_Day_Arrays/05_day_starter/index.html
+++ b/05_Day_Arrays/05_day_starter/index.html
@@ -9,7 +9,7 @@
30DaysOfJavaScript:05 Day
Arrays
-
+
diff --git a/05_Day_Arrays/05_day_starter/scripts/main.js b/05_Day_Arrays/05_day_starter/scripts/main.js
index e1bb413..23a97e4 100644
--- a/05_Day_Arrays/05_day_starter/scripts/main.js
+++ b/05_Day_Arrays/05_day_starter/scripts/main.js
@@ -1,5 +1,210 @@
+
+//alert('Open the browser console whenever you work on JavaScript')
+//alert('Open the console and check if the countries has been loaded')
+
+
+//1. Declare an empty array;
+ const emptyArr = []
+
+//2. Declare an array with more than 5 number of elements
+ const numbers = [1, 2, 3, 4, 5]
+
+//3. Find the length of your array
+ console.log('numbers length:',numbers.length)
+
+//3. Get the first item, the middle item and the last item of the array
+ console.log(numbers[0], numbers[2], numbers[4])
+
+//4. Declare an array called mixedDataTypes, put different data types in the array and find the length of the array. The array size should be greater than 5
+ const mixedDataTypes = [52, 'Potatoes', true, {}, [1,2] ]
+ console.log(mixedDataTypes.length)
+
+//5. Declare an array variable name itCompanies and assign initial values Facebook, Google, Microsoft, Apple, IBM, Oracle and Amazon
+ const itCompanies = ['Facebook', 'Google', 'Microsoft', 'Apple', 'IBM', 'Oracle', 'Amazon']
+
+//6. Print the array using console.log()
+ console.log(itCompanies)
+
+//7. Print the number of companies in the array
+ console.log(itCompanies.length)
+
+//8. Print the first company, middle and last company
+ console.log(itCompanies[0], itCompanies[3], itCompanies[6])
+
+//9 Print out each company
+ console.log(itCompanies.slice())
+
+//10. Change each company name to uppercase one by one and print them out
+ console.log(itCompanies[0].toUpperCase(), itCompanies[1].toUpperCase(), itCompanies[2].toUpperCase(), itCompanies[3].toUpperCase(), itCompanies[4].toUpperCase(), itCompanies[5].toUpperCase(), itCompanies[6].toUpperCase() )
+
+//11. Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
+ console.log(`${itCompanies.join(', ')} are big IT companies.`)
+
+//12. Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
+ let enter = 'Google'
+ let index = itCompanies.indexOf(enter)
+ if(index !== -1){
+ console.log(`${itCompanies[index]} found`)
+ }else{
+ console.log(`${enter} is not found`)
+ }
+
+//13. Filter out companies which have more than one 'o' without the filter method
+for (let i = 0; i < itCompanies.length; i++) {
+ let myStr = itCompanies[i];
+ let count = 0;
+ let position = myStr.indexOf("o");
+ while ( position != -1 ) {
+ count++;
+ position = myStr.indexOf("o", position + 1);
+ }
+ if (count >= 2) {
+ console.log(itCompanies[i]);
+ }
+ }
+
+ //With regext
+let pattern = /o/gi;
+for (let i = 0; i < itCompanies.length; i++) {
+ if (itCompanies[i].match(pattern) && itCompanies[i].match(pattern).length >= 2) {
+ console.log(itCompanies[i]);
+ }
+}
+
+//14. Sort the array using sort() method
+ console.log(itCompanies.sort())
+
+ const arr = [45,13,1,5,6,8,12,14,20,19,23]
+ const compare = (a,b)=> a-b
+ console.log(arr.sort(compare))
+
+//15. Reverse the array using reverse() method
+const reverse = arr.reverse() //[45, 23, 20, 19, 14, 13, 12, 8, 6, 5, 1]
+
+//16. Slice out the first 3 companies from the array
+const itCompaniesSlice = itCompanies.slice(3)
+console.log(itCompaniesSlice)
+
+//17. Slice out the last 3 companies from the array
+ const sliceLast = itCompanies.slice(0,4)
+ console.log(sliceLast)
+
+//18. Slice out the middle IT company or companies from the array
+console.log(itCompanies.slice(3,4))
+
+//19. Remove the first IT company from the array
+console.log(itCompanies.slice(1))
+
+//20. Remove the middle IT company or companies from the array
+console.log(itCompanies)
+console.log(`Muestra el array mutado apartir del indice 2 y extrayendo 3 elementos ${itCompanies.splice(2,3,'Netflix' )}`)
+console.log(`El array original con el parametro 'Netflix' agregado ${itCompanies}`)
+
+//21. Remove the last IT company from the array
+const removeLastIt = itCompanies.slice(0,4) //Amazon, Apple, Netflix,Microsoft,
+//22. Remove all IT companies
+const removeAllIt = itCompanies.splice() //[]
+
+//Exercise: Level 2
+
+//1. Create a separate countries.js file and store the countries array in to this file, create a separate file web_techs.js and store the webTechs array in to this file. Access both file in main.js file
+
+//2. First remove all the punctuations and change the string to array and count the number of words in the array
+let text =
+'I love teaching and empowering people. I teach HTML, CSS, JS, React, Python.'
+console.log(text)
+let replace = text.replace(/[^\w ]/g, '');
+console.log(replace)
+const words = text.split(' ')
+console.log(words)
+console.log(words.length)
+
+//3. In the following shopping cart add, remove, edit items
+const shoppingCart = ['Milk', 'Coffee', 'Tea', 'Honey']
+/*add 'Meat' in the beginning of your shopping cart if it has not been already added
+add Sugar at the end of you shopping cart if it has not been already added
+remove 'Honey' if you are allergic to honey
+modify Tea to 'Green Tea'*/
+
+shoppingCart.splice(0,0,'Meat')
+shoppingCart.splice(3,2,'Sugar','Green Tea')
+//shoppingCart.splice(4,2,'Green Tea')
+console.log(shoppingCart)
+
+//4. In countries array check if 'Ethiopia' exists in the array if it exists print 'ETHIOPIA'. If it does not exist add to the countries list.
+
+ let i = countries.indexOf('Ethiopia')
+ if(i) console.log(countries[i]), countries.splice(i,1,'ETHIOPIA')
+ console.log(countries)
+
+//5. In the webTechs array check if Sass exists in the array and if it exists print 'Sass is a CSS preprocess'. If it does not exist add Sass to the array and print the array.
+const webTechs = [
+ 'HTML',
+ 'CSS',
+ 'JavaScript',
+ 'React',
+ 'Redux',
+ 'Node',
+ 'MongoDB',
+
+ ]
+
+ webTechs.includes('Sass')? console.log('Sass is a CSS preprocess'): webTechs.unshift('Saas')
+ console.log(webTechs)
+
+//6. Concatenate the following two variables and store it in a fullStack variable.
+const frontEnd = ['HTML', 'CSS', 'JS', 'React', 'Redux']
+const backEnd = ['Node','Express', 'MongoDB']
+let fullStack = frontEnd.concat(backEnd)
+console.log(fullStack)
+
+//Exercise: Level 3
+
+//1.The following is an array of 10 students ages:
+const ages = [19, 22, 19, 24, 20, 25, 26, 24, 25, 24]
+//-Sort the array and find the min and max age
+ages.sort((a,b) => a-b)
+console.log(ages)
+let max = Math.max(...ages)
+let min = Math.min(...ages)
+const minMax = [max,min]
+console.log(`The min and max from ages is ${minMax}`)
+
+//-Find the median age(one middle item or two middle items divided by two)
+if(ages.length % 2 === 0 ){
+ middle = ages.slice(ages.length / 2 - 1, ages.length / 2 + 1)
+ median = middle.reduce((a, b)=>a + b) / 2
+ console.log(median)
+} console.log(ages.slice(ages.length / 2, ages.length / 2 + 1))
+
+
+//°Find the average age(all items divided by number of items)
+const average = Math.round(ages.reduce((a,b) => a+b) / ages.length)
+console.log(`The average from ages is ${average}`)
+
+//°Find the range of the ages(max minus min)
+let range = console.log(max - min)
+
+//°Compare the value of (min - average) and (max - average), use abs()
+console.log(Math.abs(min-average))
+console.log(Math.abs(max-average))
+
+//method 1.Slice the first ten countries from the countries array
+let slice = countries.slice(0,10)
+console.log(slice)
+
+//2. Find the middle country(ies) in the countries array
+console.log(countries.slice(countries.length / 2-1 ,countries.length /2 + 1))
+
+//3. Divide the countries array into two equal arrays if it is even. If countries array is not even , one more country for the first half.
+countries.length % 2 === 0? console.log( countries.slice(countries.length / 2 )) : countries.splice(countries.length/ 2 + 1, 0, 'Bakutan')
+console.log(countries.indexOf('Bakutan'))
console.log(countries)
-alert('Open the browser console whenever you work on JavaScript')
-alert('Open the console and check if the countries has been loaded')
-fañsdfñlsaf aldfflka jdlkfaflk
\ No newline at end of file
+let string = 'I am string'
+let string2 = string[0] = 'T'
+console.log(string2)
+console.log(string)
+console.log(string.indexOf('s'))
+
+
diff --git a/05_Day_Arrays/05_day_starter/scripts/solucion.js b/05_Day_Arrays/05_day_starter/scripts/solucion.js
deleted file mode 100644
index 23ebb8d..0000000
--- a/05_Day_Arrays/05_day_starter/scripts/solucion.js
+++ /dev/null
@@ -1 +0,0 @@
-afadsf ad afsdf asdfa
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..3bececc
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,6 @@
+{
+ "name": "30-Days-Of-JavaScript",
+ "lockfileVersion": 2,
+ "requires": true,
+ "packages": {}
+}
diff --git a/pruebas_propias/array_methods.js b/pruebas_propias/array_methods.js
new file mode 100644
index 0000000..0c1c702
--- /dev/null
+++ b/pruebas_propias/array_methods.js
@@ -0,0 +1,84 @@
+
+//filtar con ciclo for del array los numeros menores que 100
+let nums= [1, 120, 23, 45, 102]
+ function filtrarMenoresQue100(numeros){
+ let menoresQue100 = [];
+ for(let i = 0; i< numeros.length; i++){
+ if(numeros[i] < 100){
+ menoresQue100.push(numeros[i])
+ }
+ }
+ return menoresQue100;
+ }
+
+ console.log(filtrarMenoresQue100(nums).slice(0,2))
+
+ function createGodzilla(color, weight = 200, sound, powers){
+
+ }
+
+ // desestructuracion
+
+ createGodzilla('blue', undefined, ['lighting'])
+
+ let godzillaParams = {
+ color: 'blue',
+ weight: 200,
+ sound: 'GROOARR',
+ powers: ['lighting', 'nuclear bomb']
+ }
+
+ createGodzilla(godzillaParams)
+
+ const adversario = 'Lobezno'
+
+ const lokiDisfraces = {
+ 'iron Man': 'Magneto',
+ Thor: () => 'Odin',
+ Hulk: 'Thanos',
+ Lobezno: 'Magneto'
+ }
+
+ const lokiDefaultDisfraz = 'Loki'
+
+ const loki = lokiDisfraces[adversario] || lokiDefaultDisfraz
+ console.log(loki)
+
+
+ let numeros = [1,2,3,4,]
+
+ numeros.reduce((a,b)=> a + b)
+ console.log(numeros) //10
+
+ //filter items which have more than one 'o'
+ for (let i = 0; i < itCompanies.length; i++) {
+ let myStr = itCompanies[i];
+ let count = 0;
+ let position = myStr.indexOf("o");
+ while ( position != -1 ) {
+ count++;
+ position = myStr.indexOf("o", position + 1);
+ }
+ if (count >= 2) {
+ console.log(itCompanies[i]);
+ }
+ }
+
+//filter items
+ let lenguaje =['javascript', 'php', 'pyton', 'java', 'C++' ]
+ console.log(lenguaje.indexOf('c'))
+ let arr = []
+let filtrado = lenguaje.filter(function(element) {
+
+ if( element.indexOf('p') != -1 ){
+ arr.push(element)
+ };
+} )
+
+// filter whit reduce
+
+const itCompanies = ['Facebook', 'Google', 'Microsoft', 'Apple', 'IBM', 'Oracle', 'Amazon']
+
+const filteredArray = (arr, elem) => arr.reduce((acc, cur) => (cur.includes(elem) && acc.push(cur),acc), []);
+
+console.log(filteredArray(itCompanies, 'i' ))