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‎00-introduction.js

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console.log('Welcome JavaScript');

‎01-variables.js

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// Declaring different variables of different data types
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let firstName = "Asabeneh";
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let lastName = "Yetayeh";
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let location = "Helsinki";
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const country = "Finland";
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let age = 100;
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let isMarried = true;
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const gravity = 9.81;
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const boilingPoint = 100;
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const PI = 3.14;
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console.log(firstName, lastName, location, country, age, gravity, PI);
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// Variables can also be declaring in one line separated by comma
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let name = "Asabeneh",
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job = "Teacher",
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live = "Finland";
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console.log(name, job, live)
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‎02-comment.js

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//Commenting in JavaScript
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//There is is two way ways of commenting JavaScript:single line and multiline comment
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//1.Signle line comment
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// let firstName = "Asabeneh";
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// let lastName = "Yetayeh";
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// let location = "Helsinki";
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//2.Multiple line comment
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/*
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const country = "Finland";
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let age = 100;
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let isMarried = true;
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const gravity = 9.81;
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const PI = 3.14;
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*/

‎03-concationation.js

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// Declaring different variables of different data types
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let firstName = "Asabeneh";
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let lastName = "Yetayeh";
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let fullName = firstName + " " + lastName; // concatination, merging to string together.
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console.log(fullName);
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var personInfoOne = fullName + ".I am " + age + ". I live in " + country; // ES5
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var personInfoTwo = `I am ${fullName}.I am ${age}. I live in ${country}`; //ES6 - String interpolation method
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console.log(personInfoOne);
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console.log(personInfoTwo);

‎04-string_interpolation.js

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let firstName = "Asabeneh";
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let letlastName = "Yetayeh";
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var age = 200; // number data type
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var country = "Finland";
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var job = 'teacher';
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let lang = 'JavaScript'
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var personInfo = `I am ${fullName}.I am a ${age} years old. I am a ${job} and I love teaching.
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I live in ${country}.`; //ES6 - String interpolation method
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console.log(personInfo);
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let numberOne = 10;
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let numberTwo = 90;
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console.log(`The sum of ${numberOne} and ${numberTwo} is ${numberOne + numberTwo}.`);
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‎05-numbers.js

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let age = 35;
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let gravity = 9.81;
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let PI = 3.14;
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let temperature = 37;
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const boilingPoint = 100;
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console.log(age);
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console.log(gravity);
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console.log(PI);

‎05-string-method.js

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/*
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=== String Built in Methods ===
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*/
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let firstName = "Asabeneh";
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let lastName = "Yetayeh";
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let location = "Helsinki";
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console.log(firstName.length); // to check the length of a string
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console.log(firstName.toUpperCase()); // to capitalize
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console.log(firstName.toLowerCase()); // to change to lower case letters
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let company = 'google'
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var firstLetter = company.slice(0, 1); // to slice out the first letter of the word
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var remainingLetters = company.slice(1, company.length);
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console.log(firstLetter);
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console.log(remainingLetters);
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var modifiedName = firstLetter.toUpperCase() + remainingLetters;
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console.log(modifiedName);
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var school = "International Academy Award";
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console.log(school.split()); // creates an array of one item
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console.log(school.split("")); // it creates an array of letters and spaces;
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console.log(school.split(" ")); // creates an array of words
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console.log(school.indexOf("A")); // gives the index of the A in the string which is case sensitive
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console.log(school.lastIndexOf("A")); //the last A, which is A from the word Award
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console.log(school.includes("rify")); // it checks if the string exist and returns boolean
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console.log(school.includes("Award")); // it checks if the string exist and returns boolean
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console.log(school.includes("demy")); // it checks if the string exist and returns boolean
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console.log(school.startsWith("Inter")); // checks if the string starts with the provided value and returns boolean
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var modifiedSchool = school.split(" ");
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console.log(modifiedSchool);

‎06-arthimetic_operators.js

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let numOne = 4;
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let numTwo = 3;
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let sum = numOne + numTwo;
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let diff = numOne - numTwo;
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let mult = numOne * numTwo;
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let div = numOne / numTwo;
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let remainder = numOne % numTwo;
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console.log(sum);
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console.log(diff);
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console.log(mult);
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console.log(div);
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console.log(remainder)

‎07-boolean.js

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let isRaining = false;
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let hungery = false;
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let isMarried = true;

‎08-template_literals.js

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let templateLiteralString = `String literals
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is a very handy way to write strings.`

‎09-typeof.js

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/*
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=== Checking Data types ===
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*/
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console.log (typeof firstName); // it gives string
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console.log (typeof age); // it gives number
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console.log (typeof firstName === 'string'); // returns true
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console.log (typeof age === 'number'); // returns true

‎10-if.js

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//if
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let isRaining = true;
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if (isRaining) {
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console.log("Remember to take your rain coat.");
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}

‎11-ifelse.js

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//if else
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if (isRaining) {
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console.log("It is raining. You need a rain coat.");
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} else {
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console.log("It is not raining. No need for rain coat.");
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}

‎12-if-else-if-else.js

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// if else if else
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let weather = 'sunny';
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if (weather === "rainy") {
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console.log("It is raining. You need a rain coat.");
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} else if (weather === "cloudy") {
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console.log("It might be cold you need a jacket.");
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} else if (weather === "sunny") {
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console.log("Go out freely.");
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} else {
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console.log("It is not raining. No need for rain coat.");
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}

‎14-switch.js

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// Switch
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var weather = "cloudy";
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switch (weather) {
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case "rainy":
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console.log("It is raining. You need a rain coat.");
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break;
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case "cloudy":
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console.log("It might be cold you need a jacket.");
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break;
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case "sunny":
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console.log("Go out freely.");
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break;
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default:
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console.log("It is not raining. No need for rain coat.");
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break;
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}

‎15-ternary-operator.js

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let isRaining = true;
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isRaining ? console.log("You need a rain coat.") : console.log("No need for a rain coat.");

‎16-array.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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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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];
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const numbers = [0, 3.14, 9.81, 37, 98.6, 100];
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const shoppingCart = [
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"Milk",
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"Mango",
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"Tomato",
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"Potato",
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"Avocado",
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"Meat",
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"Eggs",
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"Sugar"
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];
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console.log(webTechs);
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console.log(webTechs.length); // => to know the size of the array, which is 7
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console.log(webTechs[0]); //--> HTML;
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console.log(webTechs[webTechs.length - 1]); //--> MongoDB
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console.log(countries);
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console.log(numbers);
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console.log(shoppingCart);

‎17-forloop.js

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for (var i = 1; i <= 10; i++) {
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console.log(`${i}x${i}=${i * i}`);
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}

‎18-whileloop.js

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var i = 0;
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while (i <= 10) {
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console.log(`${i}x${i}=${i * i}`);
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i++;
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}

‎19-dowhileloop.js

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// do while
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var j = 11;
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do {
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console.log(`${j}x${j}=${j * j}`);
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j++;
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} while (j <= 10);

‎20-functions.js

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// function without parameters
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function addTwoNumbers() {
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var numOne = 10;
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var numTwo = 20;
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var sum = numOne + numTwo;
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console.log(sum);
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}
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addTwoNumbers(); // function has to be called to be executed
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// Function without parater doesn' take input, so lets make a parameter with parameter
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function sumTwoNumbers(numOne, numTwo) {
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var sum = numOne + numTwo;
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console.log(sum);
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}
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sumTwoNumbers(10, 20); // calling functions
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// If a function doesn't return it doesn't store data, so it should return
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function sumTwoNumbersAndReturn(numOne, numTwo) {
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var sum = numOne + numTwo;
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return sum;
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}
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console.log(sumTwoNumbersAndReturn(10, 20));
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function printFullName(firstName, lastName) {
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return `${firstName} ${lastName}`;
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}
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console.log(printFullName("Asabeneh", "Yetayeh"));
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console.log(printFullName("Dean", "Phan"));
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function square(number) {
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return number * number;
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}
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console.log(square(10));
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// this function takes array as a parameter and sum up the numbers in the array
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function sumArrayValues(arr) {
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var sum = 0;
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for (var i = 0; i < arr.length; i++) {
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sum = sum + numbers[i];
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}
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return sum;
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}
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const numbers = [1, 2, 3, 4, 5];
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console.log(sumArrayValues(numbers));
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‎index.html

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<DOCTYPE html>
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<html>
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<head>
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<title>JavaScript for Everyone</title>
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<!--
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JavaScript code can be written in the head or the body. But it is preferable at the body
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<script src="./variables.js">
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</script> -->
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</head>
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<body>
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<script src="./variables.js">
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</script>
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</body>
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</html>

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