Functions in javascript

JavaScript FUNCTION?

*A JavaScript function is a block of code.

*A JavaScript function is executed when “something” invokes it.

SYNTAX ….⬇️

A function is defined with the function keyword, followed by a name, followed by parentheses ().

The code to be executed, by the function, is placed inside curly brackets: {}

TRY THIS:
function function_name()
{
console.log("hello world!");
}
function_name();

TRY THIS:
function greeting()
{
return `Hello ${user} !`;
}
let user = “bk_bharathikannan”;
let string =greeting();
console.log(string);
                         OR
function greeting()
{
return "Hello " + user+"!!";
}
let user = "bk_bharathikannan"
let string =greeting();
console.log(string);

Function parameters & Function arguments…⬇️

Function parameters are the names of variables present in the function definition. Function arguments are the real values that are passed to the function and received by them.

TRY THIS:
function greeting(user)
{
return "Hello "+ user +  "!!";
}
let string =greeting(“bk_bharathikannan”);
console.log(string);

FUNCTION EXPRESSION⬇️

Anonymous Function⬇️

Anonymous Function is a function that does not have any name. Normally we use the function keyword before the function name to define a function in JavaScript.But, whenever we use anonymous functions in JavaScript, we use only the function keyword without the function name.

TRY THIS:
let anonymous_function = function(num1 ,num2)
{
  return num1 * num2;
}
anonymous_function(5,5);
                      
                             OR
let anonymous_function = function(num1 ,num2)
{
  return num1 * num2;
}
 let result =anonymous_function(5,5);
 console.log(result);
let anonymous_function = function(num1 ,num2)
{
  return num1 * num2;
}
let sum =anonymous_function;
 let result =sum(5,5);
 console.log(result);

Local — variable(function)⬇️

* They can only be accessed from within the function.

let str = "bk_bharathikannan";
function string()
{
console.log("THE STRING IS " +str);
}
string();

Global — variable(function)⬇️

A variable declared outside a function, Becomes GLOBAL……

function string() 
{
    let name ="bk";
}
console.log(name);
string();

ARROW FUNCTION:-⬇️

* Arrow functions were introduced in ES6.

* Arrow functions allow us to write shorter function syntax:

let myFunction = (a, b) => a * b;

let myFunction = (a, b) => a * b;
myFunction(10,10);

ARROW FUNCTION

HOISTING :-⬇️

In JavaScript, a variable can be declared after it has been used is known as Hoisting…..

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