Functions and their methods in Java Script!

Functions

◾Functions are one of the fundamental building blocks in Java Script.It is a block of code designed to perform particular task.

◾Why Function?

You can reuse code:-Define the code once, and use it many times. You can use the same code many times with different arguments, to produce different results.

◾Examples:

There are different way to define a function:

1.

//<****first WAY***>

//name of fuction is sayhello

let sayHello = function(name){

console.log(`Greeting msg for ${name}`) 

//use the $ sign to fetch value of variable

console.log(`hii ${name}`)

}

//calling fuction

sayHello('pritpal');

2.

//<------2nd---------------->

let fullNameMaker = function(fname,lname){

    console.log('WELCOME')

    console.log(`happy to have you, ${fname} ${lname}`)

}

//calling

fullNameMaker('Pritpal','Dhillon')

3.

//<-----------3rd----------->

//function to passing arrguments

let myAdder = function(num1,num2){

    let added = num1 + num2

    return added

}

//2 ways to print 

// let result  = myAdder(3,6)

// console.log(result)

console.log(myAdder(3,6))

4.

//<---------Default Parameter ------------->

let guestUser = function(name = 'BCA',course = '2'){

    return 'hello ' + name + ' and ur course is '+course

    }

    console.log(guestUser('MCA',1)) //BCA is going to replaced by MCA