parent
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// comments can make code readable
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// Welcome to 30DaysOfJavaScript
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/*
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comments can make code readable,
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easy to reuse and informative
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*/
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console.log(typeof studentName);
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console.log(typeof learning);
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console.log(typeof age);
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console.log(typeof score);
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console.log(typeof grade);
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// Create a variable.js file and declare variables and assign string, boolean, undefined and null data types
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let newStudentName = "Mujeeb ur Rahman";
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let learning = true;
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let newAge = 25;
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let score;
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let grad = null;
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let firstVariable;
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let secondVariable;
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let thirdVariable;
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let fourthVariable;
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let fifthVariable = "fifthVariable";
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let sixthVariable = 6;
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let seventhVariable = true;
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let eighthVariable = 8.0;
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let myFirstName = "Mujeeb ur",
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myLastName = "Rahman",
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materialStatus = "single",
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myCountry = "Pakistan",
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myAge = 30;
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let yourAge = 25;
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console.log(`I am ${myAge} years old`);
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console.log(`You are ${yourAge} years old`);
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>30DaysOfJavaScript</title>
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</head>
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<head>
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<title>30DaysOfJavaScript</title>
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</head>
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<body>
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<h1>30DaysOfJavaScript:03 Day</h1>
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<h2>Introduction</h2>
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<button onclick="alert('Welcome to 30DaysOfJavaScript!');">Click Me</button>
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<script src="./helloworld.js"></script>
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<script src="./introduction.js"></script>
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<script src="./variable.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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<body>
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<h1>30DaysOfJavaScript:03 Day</h1>
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<h2>Introduction</h2>
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<button onclick="alert('Welcome to 30DaysOfJavaScript!');">Click Me</button>
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<script src="./helloworld.js"></script>
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<script src="./introduction.js"></script>
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<script src="./variable.js"></script>
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<script src="./main.js"></script>
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<script src="./day1_solution/variable.js"></script>
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<script src="./day1_solution/datatypes.js"></script>
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</body>
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</html>
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// the variable values can be accessed from other variable.js file
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console.log(firstName, lastName, country, city, age, isMarried)
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console.log(gravity, boilingPoint, PI) // 9.81, 100, 3.14
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console.log(name, job, live)
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console.log(firstName, lastName, country, city, age, isMarried);
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console.log(gravity, boilingPoint, PI); // 9.81, 100, 3.14
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console.log(name, job, live);
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console.log(studentName, studentJob, studentLive);
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// Declaring different variables of different data types
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let firstName = 'Asabeneh' // first name of a person
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let lastName = 'Yetayeh' // last name of a person
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let country = 'Finland' // country
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let city = 'Helsinki' // capital city
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let age = 100 // age in years
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let isMarried = true
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let firstName = "Asabeneh"; // first name of a person
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let lastName = "Yetayeh"; // last name of a person
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let country = "Finland"; // country
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let city = "Helsinki"; // capital city
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let age = 100; // age in years
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let isMarried = true;
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// Declaring variables with number values
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const gravity = 9.81 // earth gravity in m/s2
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const boilingPoint = 100 // water boiling point, temperature in oC
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const PI = 3.14 // geometrical constant
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const gravity = 9.81; // earth gravity in m/s2
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const boilingPoint = 100; // water boiling point, temperature in oC
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const PI = 3.14; // geometrical constant
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// Variables can also be declaring in one line separated by comma
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let name = 'Asabeneh', //name of a person
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job = 'teacher',
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live = 'Finland'
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let name = "Asabeneh", //name of a person
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job = "teacher",
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live = "Finland";
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let studentName = "Mujeeb ur Rahman",
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studentJob = "software learner",
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studentLive = "Pakistan";
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