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+// Exercise: Level 1 - Arrays
+
+// Declare an empty array;
+const emptyArray = [];
+
+// Declare an array with more than 5 number of elements
+const arrayWithFiveElements = [5, 4, 3, 2, 1];
+
+// Find the length of your array
+arrayWithFiveElements.length;
+
+// Get the first item, the middle item and the last item of the array
+const firtItem = arrayWithFiveElements[0];
+const middleItem = arrayWithFiveElements[Math.floor(arrayWithFiveElements.length / 2)];
+const lastItem = arrayWithFiveElements[arrayWithFiveElements.length - 1];
+
+// 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 = ['hi', 5, true, 'book', { 1: 5, 2: 3, 3: 2}, 4, 1];
+mixedDataTypes.length;
+
+// Declare an array variable name itCompanies and assign initial values Facebook, Google, Microsoft, Apple, IBM, Oracle and Amazon
+let itCompanies = ['Facebook', 'Google', 'Microsoft', 'Apple', 'IBM', 'Oracle','Amazon'];
+
+// Print the array using console.log()
+console.log(itCompanies);
+
+// Print the number of companies in the array
+console.log(itCompanies.length);
+
+// Print the first company, middle and last company
+const firstCompany = itCompanies[0];
+const middleCompany = itCompanies[Math.floor(itCompanies.length / 2)];
+const lastCompany = itCompanies[Math.floor(itCompanies.length - 1)]
+
+console.log('firstCompany: ', firstCompany, '; middleCompany: ', middleCompany, ';  lastCompany: ', lastCompany);
+
+// Print out each company
+for (let i = 0; i < itCompanies.length; i++) {
+    console.log(itCompanies[i]);
+}
+
+// Change each company name to uppercase one by one and print them out
+let companies = [];
+for (let i = 0; i < itCompanies.length; i++) {
+    let uppercaseCompany = itCompanies[i].toUpperCase();
+    companies.push(uppercaseCompany)
+}
+console.log(companies);
+
+// Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
+console.log(`${itCompanies[0]}, ${itCompanies[1]},  ${itCompanies[2]},  ${itCompanies[3]},  ${itCompanies[4]},  ${itCompanies[5]}, and  ${itCompanies[6]} are big IT companies.`)
+
+
+// Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
+
+let companyIndex = itCompanies.indexOf(company);
+companyIndex === -1 ? console.log(`${company} is not found.`) : console.log(`${company}`)
+
+// Filter out companies which have more than one 'o' without the filter method
+
+// Sort the array using sort() method
+
+// Reverse the array using reverse() method
+
+// Slice out the first 3 companies from the array
+
+// Slice out the last 3 companies from the array
+
+// Slice out the middle IT company or companies from the array
+
+// Remove the first IT company from the array
+
+// Remove the middle IT company or companies from the array
+
+// Remove the last IT company from the array
+
+// Remove all IT companies
\ No newline at end of file