JS Functions

Definition

• Function is a named block of statements which can be executed/used as per need again and again in the program simply by writing its name and can return some value.

Features

• It is useful in making a program modular and understandable.
• Parameters : The arguments received by the function in a list of corresponding values are called parameters. These values can be assigned to local variables within the function.
• The return statement is used to return a value from a function. A variable using assignment operator can hold the returned value.
• Nested Function : When a function is called inside another function, as per need is known as Nested function.

To Define a function :

• Syntax :

• Example :

function msg()
{
  document.write(“Hello India“);
}

To Call a function :

• A function can be called by simply writing the name of the function along with the name & list of arguments, if any present in the function.
• A function call can also be used in an event handler code also.
• Syntax :

function_name(parameter_list);

• Example :

msg();