diff --git a/solutions/day-01/level1.js b/solutions/day-01/level1.js
index bc1ff80..4d78f14 100644
--- a/solutions/day-01/level1.js
+++ b/solutions/day-01/level1.js
@@ -18,45 +18,60 @@ console.log(mixedDataTypes.length);
 
 // 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'];
-// Print the array using console.log()
+// // 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 joinComp = itCompanies[0] + ', ' + itCompanies.slice(3, 4) + ', ' + itCompanies.slice(6, 7);
+// console.log(joinComp);
+// // Print out each company
+// itCompanies.forEach((element) => {
+//     console.log(element);
+// });
+// // Change each company name to uppercase one by one and print them out
+// itCompanies.forEach((e) => {
+//     let upCase = e.toUpperCase();
+//     console.log(upCase);
+// });
+// // Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
+// let sent = ' and ' + itCompanies[6] + ' are big IT companies.';
+// itCompanies.pop();
+// console.log(itCompanies + sent);
+// // 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('Apple') === true) {
+//     console.log('Apple');
+// } else {
+//     console.log('Company is not found');
+// }
+// // Filter out companies which have more than one 'o' without the filter method
+// itCompanies.forEach((element) => {
+//     if (element.includes('o')) {
+//         console.log(element);
+//     }
+// });
+
+// // Sort the array using sort() method
+// console.log(itCompanies.sort());
+// // Reverse the array using reverse() method
+// console.log(itCompanies.reverse());
+// // Slice out the first 3 companies from the array
+// console.log(itCompanies.slice(0, 3));
+// // Slice out the last 3 companies from the array
+// console.log(itCompanies.slice(3));
+// // Slice out the middle IT company or companies from the array
+// console.log(itCompanies);
+// let midItems = itCompanies.splice(1, 4);
+// console.log(midItems);
+// // Remove the first IT company from the array
+// itCompanies.shift();
+console.log(itCompanies);
+// Remove the middle IT company or companies from the array
+// itCompanies.splice(1,5)
+console.log(itCompanies);
+// Remove the last IT company from the array
+// itCompanies.pop();
 console.log(itCompanies);
-// Print the number of companies in the array
-console.log(itCompanies.length);
-// Print the first company, middle and last company
-const joinComp = itCompanies[0] + ', ' + itCompanies.slice(3, 4) + ', ' + itCompanies.slice(6, 7);
-console.log(joinComp);
-// Print out each company
-itCompanies.forEach((element) => {
-    console.log(element);
-});
-// Change each company name to uppercase one by one and print them out
-itCompanies.forEach((e) => {
-    let upCase = e.toUpperCase();
-    console.log(upCase);
-});
-// Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
-let sent = ' and ' + itCompanies[6] + ' are big IT companies.';
-itCompanies.pop();
-console.log(itCompanies + sent);
-// 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('Apple') === true) {
-    console.log('Apple');
-} else {
-    console.log('Company is not found');
-}
-// Filter out companies which have more than one 'o' without the filter method
-itCompanies.forEach((element) => {
-    if (element.includes('o')) {
-        console.log(element);
-    }
-});
+// Remove all IT companies
 
-// Sort the array using sort() method
-console.log(itCompanies.sort());
-// Reverse the array using reverse() method
-console.log(itCompanies.reverse());
-// Slice out the first 3 companies from the array
-console.log(itCompanies.slice(0, 3));
-// Slice out the last 3 companies from the array
-console.log(itCompanies.slice(3));
-// Slice out the middle IT company or companies from the array
+console.log(itCompanies.splice());