done level 1

solution/day-01/level1.js

@@ -0,0 +1,65 @@
+const emptyArray = [];
+const arrayOfSixElements = [1, 2, 3, 4, 5, 6, 7];
+console.log(arrayOfSixElements.length);
+console.log(
+  arrayOfSixElements[0],
+  arrayOfSixElements[arrayOfSixElements.length - 1],
+  arrayOfSixElements[Math.floor(arrayOfSixElements.length / 2)],
+);
+const mixedDataTypes = [1, 2, 'string', true, 'Alex', 'Sara'];
+console.log(mixedDataTypes.length);
+
+let itCompanies = [
+  'Facebook',
+  'Google',
+  'Microsoft',
+  'Apple',
+  'IBM',
+  'Oracle',
+  'Amazon',
+];
+console.log(itCompanies);
+console.log(itCompanies.length);
+console.log(
+  itCompanies[0],
+  itCompanies[itCompanies.length - 1],
+  itCompanies[Math.floor(itCompanies.length / 2)],
+);
+itCompanies.forEach((company) => console.log(company));
+itCompanies = itCompanies.map((company) => company.toUpperCase());
+itCompanies.forEach((company) => console.log(company));
+itCompanies = itCompanies.map(
+  (company) => company.slice(0, 1) + company.slice(1).toLowerCase(),
+);
+console.log(
+  `${itCompanies.slice(0, 6).join(',')} and ${
+    itCompanies[itCompanies.length - 1]
+  } big IT companies`,
+);
+const companyInArray =
+  itCompanies.indexOf('Apple') !== -1 ? 'Apple' : 'not found';
+console.log(companyInArray);
+
+const filterArray = [];
+for (company of itCompanies) {
+  const o = company.match(/o/gi);
+  if (o && o.length == 2) {
+    filterArray.push(company);
+  }
+}
+console.log(filterArray);
+console.log(itCompanies.sort());
+console.log(itCompanies.reverse());
+console.log(itCompanies.slice(3));
+console.log(itCompanies.slice(0, 4));
+console.log(
+  itCompanies.slice(
+    Math.floor(itCompanies.length / 2),
+    Math.floor(itCompanies.length / 2) + 1,
+  ),
+);
+itCompanies.shift();
+console.log(itCompanies);
+console.log(itCompanies.slice((Math.floor(itCompanies.length / 2), 1)));
+itCompanies.pop();
+itCompanies.length = 0;