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+// Exercise: Level 1
+
+const countries = [
+  "Albania",
+  "Bolivia",
+  "Canada",
+  "Denmark",
+  "Ethiopia",
+  "Finland",
+  "Germany",
+  "Hungary",
+  "Ireland",
+  "Japan",
+  "Kenya",
+];
+
+const webTechs = [
+  "HTML",
+  "CSS",
+  "JavaScript",
+  "React",
+  "Redux",
+  "Node",
+  "MongoDB",
+];
+
+// Declare an empty array;
+let emptyArray = [];
+
+// Declare an array with more than 5 number of elements
+let arrayWithMoreThanFiveElements = [1, 2, 3, 4, 5, 6];
+
+// Find the length of your array
+let arrayLength = arrayWithMoreThanFiveElements.length;
+
+// Get the first item, the middle item and the last item of the array
+let firstItem = arrayWithMoreThanFiveElements[0];
+let middleItem = arrayWithMoreThanFiveElements[Math.floor(arrayLength / 2)];
+let lastItem = arrayWithMoreThanFiveElements[arrayLength - 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
+let mixedDataTypes = [1, "a", true, 3.14, null, [1]];
+
+// 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
+console.log(itCompanies[0]);
+console.log(itCompanies[Math.floor(itCompanies.length / 2)]);
+console.log(itCompanies[itCompanies.length - 1]);
+
+// Print out each company
+console.log(itCompanies.join(", "));
+
+// Change each company name to uppercase one by one and print them out
+console.log(itCompanies.map((company) => company.toUpperCase()));
+
+// Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
+console.log(
+  itCompanies
+    .join(", ")
+    .concat(" and ")
+    .concat(itCompanies[itCompanies.length - 1])
+);
+
+// Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
+console.log(
+  itCompanies.includes("Google") ? "Company found" : "Company not found"
+);
+
+// Filter out companies which have more than one 'o' without the filter method
+let filteredCompanies = itCompanies.reduce((company) => {
+  return company.split("o").length - 1 > 0 ? [] : [...company];
+});
+
+// Sort the array using sort() method
+itCompanies.sort((a, b) => a.localeCompare(b));
+
+// Reverse the array using reverse() method
+itCompanies.reverse();
+
+// Slice out the first 3 companies from the array
+itCompanies.slice(0, 3);
+
+// Slice out the last 3 companies from the array
+itCompanies.slice(-3);
+
+// Slice out the middle IT company or companies from the array
+itCompanies.slice(
+  Math.floor(itCompanies.length / 2),
+  Math.floor(itCompanies.length / 2) + 2
+);
+
+// Remove the first IT company from the array
+itCompanies.shift();
+
+// Remove the middle IT company or companies from the array
+itCompanies.splice(Math.floor(itCompanies.length / 2), 1);
+
+// Remove the last IT company from the array
+itCompanies.pop();
+
+// Remove all IT companies
+itCompanies.splice(0, itCompanies.length);