Doris Wiebe
2 years ago
parent
55d8e3dbc0
commit
165551480a
@ -0,0 +1,60 @@
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// typeof operator, checks datatype of variables
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console.log(typeof character);
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console.log(typeof characterIQ);
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console.log(typeof characterIsMarried);
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console.log(typeof testOfUndefined);
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console.log(typeof emptyValue);
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// variables without values
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let test1;
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let test2;
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let test3;
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let test4;
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console.log(test1, test2, test3, test4);
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// variables with assigned values
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const varWithValue = "assigned value";
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let test = false;
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console.log(test);
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test = true;
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const num = 100;
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let operator;
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console.log(varWithValue, test, num, operator);
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// variables in multiple lines
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let characterFirstName = "Penny";
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let characterLastName = "Hofstadter";
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let characterIsMarriedStatus = true;
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let characterCountry = "USA";
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let characterAgeOf = 22;
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console.log(
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characterFirstName,
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characterLastName,
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characterIsMarriedStatus,
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characterCountry,
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characterAgeOf
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);
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//variables in single line
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let firstNameTest = "Max",
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lastNameTest = "Mustermann",
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isMarriedTest = false,
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countryTest = "Musterland",
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ageTest = null;
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console.log(firstNameTest, lastNameTest, isMarriedTest, countryTest, ageTest);
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// age variables with initial values
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let myAge = 35;
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let yourAge = 74;
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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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@ -1 +1,13 @@
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console.log('Hello, World!')
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console.log("Hello, World!");
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// comments
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// single comment: comments can make code readable
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// Welcome to 30DaysOfJavaScript
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/*
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multiline comment:
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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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@ -1,19 +1,17 @@
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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="./datatypes.js"></script>
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</body>
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</html>
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@ -1,20 +1,37 @@
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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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// my own variables
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let character = "Sheldon Cooper";
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console.log(character);
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character = "Leonard Hofstadter";
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console.log(character);
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const characterIQ = 173;
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console.log(characterIQ);
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console.log(character, characterIQ);
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const characterIsMarried = true;
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let testOfUndefined;
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let emptyValue = null;
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console.log(characterIsMarried, testOfUndefined, emptyValue);
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