Add solutions day 1 - arrays - lvl 1

00_Solutions/day_01/arrays-level1.js

@@ -0,0 +1,117 @@
+// Declare an empty array;
+const arr = Array()
+
+// Declare an array with more than 5 number of elements
+const six8values = Array(6).fill(8)
+
+// Find the length of your array
+console.log('Lenth of array ' + six8values.length)
+
+// Get the first item, the middle item and the last item of the array
+console.log('First value of array: ' + six8values[0])
+
+// 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
+const mixedDataTypes = [true, 'Hello', 123, false, 'World', { object: true }]
+console.log('Length of mixed Data Type array: ' + 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()
+console.log('All companies: ' + itCompanies)
+
+// Print the number of companies in the array
+var itCompaniesLength = itCompanies.length
+console.log('Number of Companies: ' + itCompaniesLength)
+
+// Print the first company, middle and last company
+console.log('Fist company: ' + itCompanies[0])
+console.log('Middle company: ' + itCompanies[Math.floor(itCompaniesLength / 2)])
+console.log('Last company: ' + itCompanies[itCompaniesLength - 1])
+
+// Print out each company
+console.log('Companies joined by ", ": ' + itCompanies.join(', '))
+
+// Change each company name to uppercase one by one and print them out
+console.groupCollapsed('Uppercase comapnies')
+for (i in itCompanies) {
+    console.log(itCompanies[i].toUpperCase())
+}
+console.groupEnd()
+
+// Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,
+// Oracle and Amazon are big IT companies.
+console.log(
+    `Sentence: ${itCompanies.slice(0, itCompaniesLength - 1).join(', ')} and ${
+        itCompanies[itCompaniesLength - 1]
+    } are big IT companies.`
+)
+
+// Check if a certain company exists in the itCompanies array. If it exist return
+// the company else return a company is not found
+var company = 'Apple'
+let index = itCompanies.indexOf(company)
+index != -1
+    ? console.log(`Company "${company}" was found at index: ` + index)
+    : console.log(`Company "${company}" was not found`)
+
+// Filter out companies which have more than one 'o' without the filter method
+console.groupCollapsed('Comapnies with double o')
+for (i in itCompanies) {
+    if (itCompanies[i].includes('oo')) {
+        console.log(itCompanies[i])
+    }
+}
+console.groupEnd()
+
+// Sort the array using sort() method
+itCompanies.sort()
+console.log('Sorted: ' + itCompanies)
+
+// Reverse the array using reverse() method
+itCompanies.reverse()
+console.log('Reversed: ' + itCompanies)
+
+// Slice out the first 3 companies from the array
+console.log('Sliced 3 first: ' + itCompanies.slice(0, 3))
+
+// Slice out the last 3 companies from the array
+console.log(
+    'Sliced 3 latest: ' +
+        itCompanies.slice(itCompaniesLength - 3, itCompaniesLength)
+)
+
+// Slice out the middle IT company or companies from the array
+console.log(
+    'Sliced middle: ' +
+        itCompanies.slice(
+            Math.floor((itCompaniesLength - 1) / 2),
+            Math.floor(itCompaniesLength / 2) + 1
+        )
+)
+
+// Remove the first IT company from the array
+itCompanies.shift()
+console.log('Removed first: ' + itCompanies)
+
+// Remove the middle IT company or companies from the array
+itCompanies.splice(Math.floor(itCompanies.length / 2), 1)
+console.log('Removed middle: ' + itCompanies)
+
+// Remove the last IT company from the array
+itCompanies.pop()
+console.log('Removed last: ' + itCompanies)
+
+// Remove all IT companies
+itCompanies.length = 0
+console.log('Emptied array: ' + itCompanies)