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arrays
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‎05-Day_array/array.js

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// Declare an empty array;
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const arr = [];
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console.log(arr);
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// Declare an array with more than 5 number of elements
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const listOfItems = ['Pen', 'Book', 'Shoe', 'Grapes', 'Brush'];
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console.log(listOfItems);
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// Find the length of your array
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console.log(listOfItems.length);
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// Get the first item, the middle item and the last item of the array
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let firstItem = listOfItems[0];
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console.log(firstItem);
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let middleItem = listOfItems[2];
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console.log(middleItem);
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let lastIndex = listOfItems.length - 1;
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console.log(listOfItems[lastIndex]);
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/* Declare an array called mixedDataTypes, put different data types in
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the array and find the length of the array. The array size should be greater than 5*/
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let mixedDataTypes = [1, 'David', 'Ghanaian', true, ];
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// Declare an array variable name itCompanies and assign initial values Facebook, Google, Microsoft, Apple, IBM, Oracle and Amazon
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const itCompanies = ['Facebook','Google','Microsoft','Apple','IBM','Oracle','Amazon'];
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console.log(itCompanies);
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console.log(itCompanies.length);
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// Print the first company, middle and last company
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let firstCompany = itCompanies[0];
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console.log(firstCompany);
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let middleCompany = itCompanies[3];
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console.log(middleCompany);
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lastIndex = itCompanies.length - 1;
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console.log(itCompanies[lastIndex]);
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// Change each company name to uppercase one by one and print them out
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let fb = itCompanies[0];
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console.log(fb.toUpperCase());
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let ggle = itCompanies[1];
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console.log(ggle.toUpperCase());
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let ms = itCompanies[2];
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console.log(ms.toUpperCase());
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let apple = itCompanies[3];
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console.log(apple.toUpperCase());
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let ibm = itCompanies[4];
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console.log(ibm.toUpperCase());
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let oracle = itCompanies[5];
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console.log(oracle.toUpperCase());
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let amazon = itCompanies[6];
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console.log(amazon.toUpperCase());
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// Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
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console.log(itCompanies.join(', '), 'are big IT companies');
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// Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
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let exits = itCompanies.indexOf('Google');
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if (exits === 1){
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console.log(itCompanies[1]);
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}
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else{
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console.log('Company is not found');
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}
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// Sort the array using sort() method
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console.log(itCompanies.sort());
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// Reverse the array using reverse() method
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console.log(itCompanies.reverse());
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// Slice out the first 3 companies from the array
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console.log(itCompanies.slice(3,7));
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// Slice out the last 3 companies from the array
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console.log(itCompanies.slice(0,4));
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console.log(itCompanies);
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// Remove the first IT company from the array
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console.log(itCompanies.splice(0,1));
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// Remove the middle IT company or companies from the array
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console.log(itCompanies.splice(2,1));
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// Remove the last IT company from the array
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console.log(itCompanies.pop());
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// Remove all IT companies
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console.log(itCompanies.splice());
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// First remove all the punctuations and change the string to array and count the number of words in the array
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let text = 'I love teaching and empowering people. I teach HTML, CSS, JS, React, Python.'
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console.log(text);
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let newText = text.split(' ');
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console.log(newText);
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console.log(newText.length);
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// In the following shopping cart add, remove, edit items
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const shoppingCart = ['Milk', 'Coffee', 'Tea', 'Honey'];
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console.log(shoppingCart);
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// add 'Meat' in the beginning of your shopping cart if it has not been already added
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shoppingCart.unshift('Meat');
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console.log(shoppingCart);
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// add Sugar at the end of you shopping cart if it has not been already added
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shoppingCart.push('Sugar');
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console.log(shoppingCart);
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// remove 'Honey' if you are allergic to honey
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shoppingCart.splice(4,1);
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console.log(shoppingCart);
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// modify Tea to 'Green Tea'
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shoppingCart[3] = 'Green Tea';
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console.log(shoppingCart);
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// Concatenate the following two variables and store it in a fullStack variable.
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const frontEnd = ['HTML', 'CSS', 'JS', 'React', 'Redux']
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const backEnd = ['Node','Express', 'MongoDB']
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const fullStack = frontEnd.concat(backEnd);
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console.log(fullStack);
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// Sort the array and find the min and max age
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const ages = [19, 22, 19, 24, 20, 25, 26, 24, 25, 24]
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console.log(ages.sort());
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// minimum age
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let minAge = Math.min.apply(null, ages);
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console.log(minAge);
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// minimum age
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let maxAge = Math.max.apply(null, ages);
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console.log(maxAge);
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// Find the median age(one middle item or two middle items divided by two)
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let medianAge = ((ages[4] + ages[5]) / 2);
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console.log(medianAge);
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// Find the average age(all items divided by number of items)
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let averageAge = (ages / ages.length);
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console.log(averageAge);

‎05-Day_array/countries.js

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const countries = [
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'Albania',
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'Bolivia',
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'Canada',
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'Denmark',
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'Ethiopia',
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'Finland',
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'Germany',
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'Hungary',
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'Ireland',
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'Japan',
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'Kenya'
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]
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// In countries array check if 'Ethiopia' exists in the array if it exists print 'ETHIOPIA'. If it does not exist add to the countries list.
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let checkArray = countries.indexOf('Ethiopia');
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if (checkArray == 4){
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console.log(countries[4]);
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}
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else{
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countries.push('Ethiopia')
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console.log(countries);
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}

‎04-Conditional-Statements/index.htm ‎05-Day_array/index.html

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<title>Conditional Statement</title>
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</head>
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<body>
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<h1>Conditional Statement</h1>
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<p>Introduces conditional statements used in JavaScript.</p>
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<ul>
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<li>if</li>
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<li>if else</li>
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<li>switch</li>
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</ul>
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<h1>Array</h1>
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<p></p>
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<script src="conditionals.js"></script>
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<script src="array.js"></script>
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<script src="countries.js"></script>
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<script src="web_techs.js"></script>
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<script src="main.js"></script>
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</body>
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</html>
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‎05-Day_array/main.js

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console.log(countries);
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console.log(webTechs);

‎05-Day_array/web_techs.js

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const webTechs = [
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'HTML',
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'CSS',
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'JavaScript',
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'React',
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'Redux',
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'Node',
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'MongoDB'
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]

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