Functions In Javascript

Build-in Functions

• alert()
• isPrime()
• Console.log()

Function Types !

• Regular Functions
• Anonymous functions
• Arrow Functions - Modern Anonymous Function
• Callbacks Functions
• Fetch API
• async wait Functions
• Promises

User-Defined Functions

Javascript File :

    

// Functions In Javascript

// creating functions
function printhello() {
    alert("Hello, Javascript Functions !");
    document.writeln("Hello, Javascript Functions");
}
// calling the functions
printhello();

document.writeln("

");

// Parameter & Arguments 
// Parameterized functions / name as variable
function para(name) {
    document.writeln("Welcome Home ", name);
}

// calling function with arguments, storing into variable
// passing different values ... 
para("Akshay Gohrava");
document.writeln("
");
para("Full-Stack Developer");

document.writeln("

");


// To Find Addition functions
function add(a, b, c) {
    document.writeln("Addtion of A,B,C is : ",a+b+c);
}
add(23,5,9);

document.writeln("

");



// Return Functions, without return , its all void functions

function square(n) {
    return n*n;
}
document.writeln("The Square of 5 is : ", square(5));

document.writeln("

");


// Return sum of 4 Numbers

function adding(a,b,c,d) {
    return a+b+c+d;
    // document.writeln("Adding of A B C D: ", a+b+c+d);
}
document.writeln("Addition with return  : ",adding(4,2,1,7));

document.writeln("

");


// Function to find Even Number is or Not !

function even(n) {
    return n%2==0;
}
document.writeln("The Number 10 is Even or Not :", even(10));

document.writeln("

");


// Program to check wheather prime or not

function isPrime(n) {
    let count = 0;
    for (let i = 1; i <= n; i++) {
       if (n % i == 0) {
         count++;
       }
        
    }
    return count == 2;
}
document.writeln("The Number 75 is prime or Not :" ,isPrime(75));

document.writeln("

");

// Anonimous Functions In Javascript

const Anonimousfuns = function () {
    document.writeln("This is Anonimous Function , stored in Variable !")
}
Anonimousfuns();

document.writeln("

");


// Anonimous Functions with parameter & Arguments

const parafun = function (a,b) {
    document.writeln("This is Parameterized and Anonimous Functions: ", a+b);
}
parafun(55,65);

document.writeln("

");


// Arrow Functions In JavaScripts

const arrowfun = () => {
    document.writeln("Hello Arrow Functions !");
}
arrowfun();

document.writeln("

");

// Single Statement Arrow Functions
const arrowfun2 = (a ,b) => document.writeln("This is Addtion : ",a+b);
arrowfun2(54,33);

document.writeln("

");



// Program to check even number with arrow functions !

const iseven = (n) => {
    const even = n%2==0;
    return even;
}
document.writeln("The number is even or not in arrow functions: ",iseven(6));


document.writeln("

");


// SetTimeout Function : is used to function can after some times

const hellosettimeout = () => {
    document.writeln("Hello, setTimeout funtion !, This display after 5 seconds")
}
setTimeout(()=> document.writeln("This display after 50 seconds") , 50000);

// Learning Topics
// Asynchronous, JavaScript is Asynchronous Language ,synchronous
// Call Back Functions is used most !to perform Asynchronous function,or csll an api !
//
// Types of Functions to Learns ......
// Function > Anonimousy functs > arrow functions > Callbacks Functions > Fetch > async wait > Promises 

 

Javascript Output :