JavaScriptPractice/all_type_function.html at main · EduKeyPath/JavaScriptPractice · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo</title>
</head>
<body>

<!--=====Function 1 alert with function======-->
<input type="button" onclick="sayHello()" value="Say Hello">
<script>
    function sayHello()
    {
       alert("Hello there!");
    }
 </script>

<!--=====Function 2 alert data with function======-->
<input type="button" onclick="sayHello('Zara', 7)" value="Say Hello">
<script>
    function sayHello(name, age)
    {
       alert(name + " is " + age + " years old.");
    }
 </script>

<!--=====Function 3 print data with var function=====-->
<p id="demo"></p>
<script>
    function myFunction(a, b) {
        return a * b;
    }

    var x = myFunction(4, 3);
    document.getElementById("demo").innerHTML = x;
</script>

<!--=====Function 4 print value with function======-->
<p id="demo14"></p>
<script>
    var a = 4;
    function myFunction() {
        document.getElementById("demo14").innerHTML = a * a;
    }
</script>

<p id="demo41"></p>
<script>
    var x = 7;
    function myFunc2(a){
        return a * a;
    }
    document.getElementById('demo41').innerHTML = myFunc2(5) * x;
</script>

<!--=====Function 5 anonymous / function expression======-->
<p id="demo3"></p>
<script>
    var x = function (a, b) {return a * b};
    document.getElementById("demo3").innerHTML = x(4, 3);
</script>

<!--=====Function 6 print data with var function======-->
<p id="demo6"></p>
<script>
    function myFunction(a, b) {
        return a * b;
    }
    var x = myFunction(4, 3) * 2;
    document.getElementById("demo6").innerHTML = x;
</script>

<!--=====Function 7 object function======-->
<p id="demo4"></p>
<script>
    var person = {
        firstName: "John",
        lastName : "Doe",
        id       : 5566,
        fullName : function() {
            return this.firstName + " " + this.lastName;
        }
    };
    document.getElementById("demo4").innerHTML = person.fullName();
</script>

<!--=====Function 8 concatenate function======-->
<input type="button" onclick="secondFunction()" value="Call Function">
<script>
    function concatenate(first, last)
    {
       var full;
       full = first + last;
       return full;
    }
    function secondFunction()
    {
       var result;
       result = concatenate('Zara', 'Ali');
       document.write (result );
    }
 </script>

<!--=====Function 9 object constructor call function======-->
<p id="demo9"></p>
<script>
    var person = {
        fullName: function() {
            return this.firstName + " " + this.lastName;
        }
    }
    var person1 = {
        firstName:"John",
        lastName: "Doe",
    }
    var person2 = {
        firstName:"Mary",
        lastName: "Doe",
    }
    var x = person.fullName.call(person1);
    document.getElementById("demo9").innerHTML = x;
</script>

<!--=====Function 10 object constructor call function======-->
<p id="demo11"></p>
<script>
    var person = {
        fullName: function(city, country) {
            return this.firstName + " " + this.lastName + "," + city + "," + country;
        }
    }
    var person1 = {
        firstName:"John",
        lastName: "Doe",
    }
    var person2 = {
        firstName:"Mary",
        lastName: "Doe",
    }
    var x = person.fullName.call(person1, "Oslo", "Norway");
    document.getElementById("demo11").innerHTML = x;
</script>

<!--=====Function 11 object constructor apply function======-->
<p id="demo12"></p>
<script>
    var person = {
        fullName: function(city, country) {
            return this.firstName + " " + this.lastName + "," + city + "," + country;
        }
    }
    var person1 = {
        firstName:"John",
        lastName: "Doe",
    }
    var x = person.fullName.apply(person1, ["Oslo", "Norway"]);
    document.getElementById("demo12").innerHTML = x;
</script>

<!--=====Function 12 object constructor new function=====-->
<p id="demo2"></p>
<script>
    var myFunction = new Function("a", "b", "return a * b");
    document.getElementById("demo2").innerHTML = myFunction(4, 3);
</script>

<!--=====Function 13 consturctor value new function======-->
<p id="demo8"></p>
<script>
    function myFunction(arg1, arg2) {
        this.firstName = arg1;
        this.lastName  = arg2;
    }
    var x = new myFunction("John","Doe")
    document.getElementById("demo8").innerHTML = x.firstName;
</script>

<!--=====Function 14 self invoke======-->
<p id="demo">0</p>
<script>
    var add = (function () {
        var counter = 0;
        return function () {
            counter += 1; return counter;
        }
    })();
    function myFunction(){
        document.getElementById("demo").innerHTML = add();
    }
</script>

</body>
</html>