JavaScript Function Declaration | JavaScript Functions - JavaScript Tutorial 57

Notes for You:: JavaScript Functions
- A function is a block of code, meant to perform a specific task.
- Whenever we want to perform some specific task, we create a function.
Creating a function:
- There are many ways in which we can create a function in JavaScript
1. Using function declaration
2. Using function expression
3. Using function constructor
4. Using IIFE (Immediately Invokable Function Expression)
1. JavaScript Function Declaration:
- A function defined with function declaration must begin with function keyword.
Syntax: /* function definition */
function functionName( [param1,param2, …. paramN] ) // function header
{
statement(s);
[return returningValue;] // by default a function returns undefined value
}
Ex: a function without parameters, without returning value
function wishHi()
{
document.write( "Hi" , "<br/>" );
}
Note: Functions get execute only when we call them
Syntax: /* function call */
functionName( [ param1, param2 …. paramN ] );
Ex:
wishHi(); // Hi
wishHi(); // Hi
wishHi(); // Hi
Note:
- replace < with less-than symbol.
- replace > with greater-than symbol.
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