exercice one - array

Test/01-js-refresher.js

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+// Exercise: Level 1
+
+const countries = [
+  'Albania',
+  'Bolivia',
+  'Canada',
+  'Denmark',
+  'Ethiopia',
+  'Finland',
+  'Germany',
+  'Hungary',
+  'Ireland',
+  'Japan',
+  'Kenya',
+]
+
+const webTechs = [
+  'HTML',
+  'CSS',
+  'JavaScript',
+  'React',
+  'Redux',
+  'Node',
+  'MongoDB',
+]
+// Declare an empty array;
+const emptyArray = []
+// Declare an array with more than 5 number of elements
+const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]
+// Find the length of your array
+console.log(numbers.length)
+// Get the first item, the middle item and the last item of the array
+console.log(numbers[0], numbers[Math.floor(numbers.length / 2)], numbers[numbers.length - 1])
+// 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 = [1, 'two', true, { name: 'John' }, [1, 2, 3, 4, 5]]
+// 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 number of companies in the array
+// Print the first company, middle and last company
+// Print out each company
+// Change each company name to uppercase one by one and print them out
+// Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon 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
+// Filter out companies which have more than one 'o' without the filter method
+// Sort the array using sort() method
+// Reverse the array using reverse() method
+// Slice out the first 3 companies from the array
+// Slice out the last 3 companies from the array
+// Slice out the middle IT company or companies from the array
+// Remove the first IT company from the array
+// Remove the middle IT company or companies from the array
+// Remove the last IT company from the array
+// Remove all IT companies