arrays: exercise level1 complete

solutions/day-01/level1.js

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+const countries = [
+  'Albania',
+  'Bolivia',
+  'Canada',
+  'Denmark',
+  'Ethiopia',
+  'Finland',
+  'Germany',
+  'Hungary',
+  'Ireland',
+  'Japan',
+  'Kenya',
+]
+
+const webTechs = [
+  'HTML',
+  'CSS',
+  'JavaScript',
+  'React',
+  'Redux',
+  'Node',
+  'MongoDB',
+]
+
+//1. Declare an empty array;
+let arr = [];
+
+//2. Declare an array with more than 5 number of elements
+const arrX = ['food', 'drinks', 'games', 'books', 'sports', 'music', 'clothes'];
+
+//3. Find the length of your array
+const arrXlength = arr1.length;
+
+//4. Get the first item, the middle item and the last item of the array
+const arrX1st = arrX[0];
+const arrXmid = arrX[Math.floor(arrX.length/2)]
+const arrXend = arrX[arrX.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
+let mixedDataTypes = [56, 'year: ', {a: 'height'}, 1978, 'name: ', true, 'Maria'];
+const mDtL = mixedDataTypes.length;
+
+//6. 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']
+
+//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 out each company
+console.log(itCompanies);
+
+//10. Change each company name to uppercase one by one and print them out
+let itCompaniesStrng = itCompanies.toString();
+let caps = itCompaniesStrng.toUpperCase();
+console.log(caps);
+
+//11. Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM, Oracle and Amazon are big IT companies.
+console.log(itCompanies.join(', ') + ' are big IT companies.');
+
+//12. Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
+itCompanies.includes('Nike')?"Nike exists":"Company is not found";
+
+//13. Filter out companies which have more than one 'o' without the filter method
+
+//14. Sort the array using sort() method
+itCompanies.sort();
+
+//15. Reverse the array using reverse() method
+itCompanies.reverse();
+
+//16. Slice out the first 3 companies from the array
+itCompanies.slice(0,3);
+
+//17. Slice out the last 3 companies from the array
+itCompanies.slice(itCompanies.length - 3);
+
+//18. Slice out the middle IT company or companies from the array
+
+
+//19. Remove the first IT company from the array
+itCompanies.shift();
+
+//20. Remove the middle IT company or companies from the array
+
+//21. Remove the last IT company from the array
+itCompanies.pop();
+
+//22. Remove all IT companies
+itCompanies.splice();