Javascript/syntax.html at master · Samra3/Javascript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <div class="wrap">
            <h1> JavaScript Syntax </h1>
            <h3> JavaScript Literals/fixed values </h3>
            <p> Numbers </p>
            <p id="demo"></p>
            <script>
                document.getElementById("demo").innerHTML = 20.92;
            </script>

            <h3> JavaScript strings </h3>
            <p id="demo1"></p>
            <script>
                document.getElementById("demo1").innerHTML = 'John Doe';
            </script>

            <br>

            <h2> JavaScript Variables </h2>
            <p> In this case, x is defined as a vairable. then, x is assigned the value of 7. </p>
            <p id="demo2"></p>
            <script>
                let x;
                x = 7;
                document.getElementById("demo2").innerHTML = 7;
            </script>

            <br>

            <h2> JavaScript Operators </h2>
            <p> Arithmetic operators are usd to compute values. </p>
            <p id="demo3"></p>
            <script>
                document.getElementById("demo3").innerHTML = (15 + 12) * 8;
            </script>
            <h4> Assigning JavaScript Values </h4>
            <p> The = operator is used to assign values to variables. </p>
            <p id="demo4"></p>
            <script>
                let a, b;
                a = 5;
                b = 6;
                document.getElementById("demo4").innerHTML = a + b;
            </script>

            <br>

            <h2> Javascript expressions </h2>
            <p> First example </p>
            <p id="demo5"></p>
            <script>
                document.getElementById("demo5").innerHTML = 25 * 15;
            </script>
            <hr>
            <p> Second example </p>
            <p id="demo6"></p>
            <script>
                var c;
                c = 6;
                document.getElementById("demo6").innerHTML = c * 10;
            </script>
            <hr>
            <p> Third example </p>
            <p id="demo7"></p>
            <script>
                document.getElementById("demo7").innerHTML = "John" + " " + "Doe";
            </script>

            <br>

            <h2> Javascript keywords </h2>
            <p> let keyword </p>
            <p id="demo8"></p>
            <script>
                let n, m;
                n = 6 + 9;
                m = n * 10;
                document.getElementById("demo8").innerHTML = m;
            </script>
            <hr>
            <p> var keyword </p>
            <p id="demo9"></p>
            <script>
                var o, p;
                o = 8 + 6;
                p = o * 20;
                document.getElementById("demo9").innerHTML = p;
            </script>

            <br>

            <p> All javascript identifiers are <b>case sensitive</b>. </p>
            <p> The variables lastName and lastname are two different variables. </p>
            <p id="demo10"></p>
            <script>
                let lastname, lastName;
                lastName = "Doe";
                lastname = "Peterson";
                document.getElementById("demo10").innerHTML = lastName;
            </script>
        </div>
    </div>
    <div class="container">
        <div class="wrap">
            <h1> JS Variables </h1>
            <p> In this example t, r and u are variables. </p>
            <p id="demo11"></p>
            <script>
                var t = 7;
                var r = 6;
                var u = t + r;
                document.getElementById("demo11").innerHTML = "The value of u is: " + u;
            </script>

            <br>

            <h2> const keyword </h2>
            <p id="demo12"></p>
            <script>
                const price1 = 15;
                const price2 = 13;
                let total = price1 + price2;
                document.getElementById("demo12").innerHTML = "The total is: " + total;
            </script>

            <br>

            <h2> Javascript data types </h2>
            <p> Strigns are written with quotes and numbers are written without quotes. </p>
            <p id="demo13"></p>
            <script>
                const pi = 3.14;
                let person = "John Doe";
                let answer = "Yes, I am";

                document.getElementById("demo13").innerHTML =
                pi + "<br>" + person + "<br>" + answer;
            </script>

            <br>

            <h2> Declaring javascript variable </h2>
            <p> Creating a variable and assigning a value to it and displaying it: </p>
            <p id="demo14"></p>
            <script>
                let carName = "Volvo";
                document.getElementById("demo14").innerHTML = carName;
            </script>

            <br>

            <h2> One statement, many variables </h2>
            <p> Delcaring many variables in one statement. </p>
            <p id="demo15"></p>
            <script>
                let person1 = "John Doe", carName1 = "Volvo", price = 200;
                document.getElementById("demo15").innerHTML = carName1;
            </script>

            <br>
            <h2> Value = undefined </h2>
            <p id="demo16"></p>
            <script>
                let firstNumber;
                document.getElementById("demo16").innerHTML = firstNumber;
            </script>

            <br>

            <h2> Javascript Arithmetic </h2>
            <p> The result of 9 + 3 + 7 is: </p>
            <p id="demo17"></p>
            <script>
                let q = 9 + 3 + 7;
                document.getElementById("demo17").innerHTML = q;
            </script>
            <p> The result of adding "John" + " " + "Doe" is: </p>
            <p id="demo18"></p>
            <script>
                let name = "John" + " " + "Doe";
                document.getElementById("demo18").innerHTML = name;
            </script>
        </div>
    </div>
</body>
</html>