✨ fix: resolution of the eexercise level 1

01_Day_JavaScript_Refresher/solutions/arrays/level1.js

@@ -0,0 +1,93 @@
+// 1 - Declare an empty array
+let arr = [];
+
+// 2 - Declare an array with more than 5 numbers of elements
+arr = ['HTML', 'CSS', 'JS', 'VueJs', 'React', 'TailwindCSS', 'Styled-components'];
+
+// 3 - Find the length of your array
+const arrLength = arr.length;
+
+// 4 - Get the first item, the middle item and the last item of the array
+let middle = Math.floor(arr.length / 2);
+let last = arr.length - 1;
+
+// 5 - 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 = [
+  'Nangazaki44',
+  7590,
+  { skills: ['HTML', 'CSS', 'JS', 'VueJs', 'React', 'TailwindCSS', 'Styled-components'] },
+  { contry: 'Angola', city: 'Luanda' },
+  true,
+  'Day 01 of 30-Days-Of-React'
+]
+
+// 6 - 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']
+
+// 7 - Print the array using console.log()
+console.log(itCompanies)
+
+// 8 - Print the number of companies in the array
+console.log('The number of companies is', itCompanies.length)
+
+// 9 - Print the first company, middle and last company
+middle = Math.floor(itCompanies.length / 2);
+last = itCompanies.length - 1;
+
+console.log('The first company is', itCompanies[0])
+console.log('The middle company is', itCompanies[middle])
+console.log('The last company is', itCompanies[last])
+
+// 10 - Print out each company
+itCompanies.map((company) => console.log(company))
+
+// 11 - Change each company name to uppercase one by one and print them out
+itCompanies.map((company) => console.log(company.toUpperCase()))
+
+// 12 - Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
+const words = itCompanies.toString(', ')
+console.log(words)
+
+// 13 - Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
+let check = itCompanies.indexOf('NCR')
+if (check != -1) {
+  console.log(itCompanies[check])
+} else {
+  console.log('Company not found!')
+}
+
+// 14 - Filter out companies which have more than one 'o'
+itCompanies.filter((company) => {
+  return company.includes('oo') 
+  ? console.log(company) 
+  : ''
+})
+
+// 15 - Sort the array using sort() method
+itCompanies.sort()
+
+// 16 - Reverse the array using reverse() method
+itCompanies.reverse()
+
+// 17 - Slice out the first 3 companies from the array
+itCompanies.slice(0, 3)
+
+// 18 - Slice out the last 3 companies from the array
+console.log(itCompanies.slice(middle + 1, last + 1))
+
+// 19 - Slice out the middle IT company or companies from the array
+itCompanies.slice(middle, middle + 1)
+
+// 20 - Remove the first IT company from the array
+itCompanies.splice(0)
+
+// 21 - Remove the middle IT company or companies from the array
+itCompanies.splice(middle, 1)
+
+// 22 - Remove the last IT company from the array
+itCompanies.pop(last)
+
+// 23 - Remove all IT companies
+itCompanies.splice()