Javascript Function

Function is basically used to reusable the code. A function is executed when you call it.

Syntax:-

function functionName(parameters){
	
	// logic implement

}

Example:- Suppose you define employeeDetails function which has two parameters name and age.

function employeeDetails(name, age){
  
  console.log("my name is "+name+" and my age is "+age);

}

You have already defined the function after that you can call the function multiple times based on your requirements.

employeeDetails("John",35);  //my name is John and my age is 35

employeeDetails("Rom",30);  //my name is Rom and my age is 30

Everything defined in the function can not be access outside the function, this is called function scoping.

function user(){
	
	var emp_name="John";
	console.log(emp_name);  
}

function user(){
	
	var emp_name="John";

}
console.log(emp_name);    

When the function call itself, it is called Immediately Invoke function.

Syntax:-

(function() {
 
// logic

})();

Example:-

(function() {

console.log("Hello");

})();

Javascript Function – Interview Questions

Javascript Function – Objective Questions (MCQs)