JavaScript functions

Types of functions

• Normal Function 
• Function Expression
• Named Function Expression
• First Class function

1. Function Statement And function declaration.

     Function is set of instruction to perform a perticular task. without repeated the code. 

function a(){
    console.log('shreyash')
}
a()

2. Function Expression

     Assign a function in variable. function acts like a value this is the function expression  

var a = function (){
    console.log('shreyash')
}
a()

3. Named Function Expression

    A Named function expression means you can have the name of the function itself and put it to an expression.

var a = function fun1(){
    console.log('shreyash')
}
a() 

              Or

var a = function (){
    console.log('shreyash')
}
a()

4. First Class Function

    Pass function inside another function argument and it able to return function 

var a = function fun1(sirname){
    console.log('shreyash', sirname)
}
a(sirname())

function sirname(){
    console.log('kolhe')
}

Difference between Parameters and Arguments?

    The value pass inside an function is called an Argument a('shreyash'); and the function are gets this value are called as parameters function fun1(name){}.

function a(name){     //parameters
    console.log(name)
}
a('shreyash')             // argument