What Is the function of JavaScript?
Functions are one of the fundamental building
blocks in JavaScript. A function is a JavaScript procedure - a set of
statements that performs a task.
To use functions, you must define or declared in
the scope from which you wish to call it.
Functions are declared or defined with the
function keyword. You can write a
function in four ways and it looks like..
JavaScript Functions 4 Ways -
1. Function
Declaration
2. Function
Expression
3. Arrow
Function Expression
4. Concise
Arrow Function expression
Example -
//Way-1
//Function Declaration
function
fn1_Square(a,
b){
let square
= a*b;
return square;
}
//Way-2
//Function Expression
const
fn2_Square = function(a,b){
let square
= a*b;
return square;
}
//Way-3
//Arrow Function Expression
const
fn3_square = (a,
b) =>
{
let square
= a*b;
return square;
}
//Way-4
//Concise Arrow Function Expression
const
fn4_square = (a,b)
=> a*b;
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