diff --git a/solutions/day-01/level1.js b/solutions/day-01/level1.js
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+/**
+ * EXERCISE: LEVEL 1
+ */
+
+// 1. Declare an empty array
+const empty = [];
+
+// 2. Declare an array with more than 5 number of elements
+const names = ['John', 'Jack', 'Betty', 'Tom', 'Pam', 'Sam'];
+
+// 3. Find the length of your array
+let arraySize = names.length;
+
+// 4. Get the first item, the middle item and the last item of the array
+let first = names[0];
+let middle = names[names.length / 2];
+let last = names[names.length - 1];
+
+// 5. Decalre an array called mixedDataTypes, put different data types in the array and find the length of the arry. The array size should be greater than 5
+const mixedDataTypes = [1, "hello", false, [], null, undefined];
+
+// 6. Declare an array variable name itCompanies and assign intial 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(itCompanies.length);
+
+// 9. Print the first company, middle and last company
+console.log(itCompanies[0]);
+console.log(itCompanies[itCompanies.length / 2]);
+console.log(itCompanies[itCompanies.length - 1]);
+
+// 10. Print out each company
+console.log(itCompanies[0]);
+console.log(itCompanies[1]);
+console.log(itCompanies[2]);
+console.log(itCompanies[3]);
+console.log(itCompanies[4]);
+console.log(itCompanies[5]);
+console.log(itCompanies[6]);
+
+// 11. Change each company name to uppercase one by one and print them out
+itCompanies[0] = 'FACEBOOK';
+console.log(itCompanies[0]);
+
+itCompanies[1] = 'GOOGLE';
+console.log(itCompanies[1]);
+
+itCompanies[2] = 'MICROSOFT';
+console.log(itCompanies[2]);
+
+itCompanies[3] = 'APPLE';
+console.log(itCompanies[3]);
+
+itCompanies[4] = 'IBM';
+console.log(itCompanies[4]);
+
+itCompanies[5] = 'ORACLE';
+console.log(itCompanies[5]);
+
+itCompanies[6] = 'AMAZON';
+console.log(itCompanies[6]);
+
+// 12. 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 `);
+
+// 13. Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
+if (itCompanies.includes("Github")) {
+    console.log(itCompanies[itCompanies.indexOf("Github")]);
+} else {
+    console.log("Company is not found");
+}
+
+// 14. Filter out companies which have more than one 'o' wihout the filter method
+itCompanies.shift();
+itCompanies.shift();
+
+// 15. Sort the array using sort() method
+itCompanies.sort();
+
+// 16. Reverse the array using reverse() method
+itCompanies.reverse();
+
+// 17. Slice our the first 3 companies from the array
+itCompanies.slice(3);
+
+// 18. Slice out the last 3 companies form the array
+itCompanies.slice(-3);
+
+// 19. Slice out the middle IT company or companies from the array
+itCompanies.slice(itCompanies.length / 2, (itCompanies.length / 2) + 1);
+
+// 20. Remove the first IT company from the array
+itCompanies.shift();
+
+// 21. Remove the middle IT company from the array
+itCompanies.splice(itCompanies.length / 2, 1);
+
+// 22. Remove the last IT company from the array
+itCompanies.pop();
+
+// 23. Remove all IT companies
+itCompanies.splice();
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