java script functions and how to utilize them

What is a JavaScript Function?

A JavaScript function is a block of code designed to perform a specific task. You can reuse this code whenever needed by simply calling the function

Example; function sayHello() {
alert("Hello!"); }

How to Declare a Function in JavaScript.

There are 3 main ways to declare a function in JavaScript.

1.Function declaration

function greet() {
console.log("Hello!"); }

then to call the function again, you call it like this

greet(); Output: Hello!

2. Function expression;
This function is stored inside a variable. Its useful when passing functions around or using them inside other functions

const greet = function() {
console.log("Hello!"); }; then to express the function expression, you call it like this

greet(); Output: Hello!

3. Arrow functions;
const greet = () => {
console.log("Hello!");
}; to call this expression you use
greet(); Output: Hello!

WE HAVE JAVASCRIPT FUNCTION WITH PARAMETERS

Function with parameters;
function greet(klaus) {
console.log("Hello, " + name + "!");
} greet("Klaus"); Output: Hello, Klaus!

WE HAVE JAVASCRIPT FUNCTIONS THAT RETURNS A VALUE

Functions that returns a value;
function add(a, b) {
return a + b; }
let sum = add(5, 3);
console.log(sum);Output: 8

FUNCTIONS AND ARGUMENTS
function greet(name) { ~ name is a parameter
console.log("Hi " + name);
} greet("Ada"); ~ "Ada" is an argument

• Parameters: Variables you set in the function

• Arguments: Actual values you pass when calling the function

RETURN AND NO RETURN FUNCTIONS:

• If a function uses return, it gives you a value back

function multiply(x, y) {
return x * y; } let result = multiply(3, 4); // result is 12

• If it doesn’t return, it just does something (like show a message) like this;

function greet() {
alert("Hello!"); }

Why Are Functions Useful?

1.Reusability – Write code once and reuse it.
2.Cleaner Code – Functions help break down complex code into smaller, readable parts.
3.Debugging is Easier – You can test individual functions to find bugs.
4.Organization – Makes code organized and modular.

Thank you for reading, see you next time.. Adios!