𝗧𝘆𝗽𝗲𝘀 𝗼𝗳 𝗙𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝘀 𝗶𝗻 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁

𝗧𝘆𝗽𝗲𝘀 𝗼𝗳 𝗙𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝘀 𝗶𝗻 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁

Functions help you organize code. You need to know the different types to write better programs.

1. Named Function You give the function a specific name. You call it by that name later. Example: function greet() { return "Hello!"; }

2. Anonymous Function These functions have no name. You often store them in variables. Example: let greet = function() { console.log("Hello!"); };

3. Function Expression You assign a function to a constant or a variable. Example: const add = function(a, b) { return a + b; };

4. Arrow Function This is a shorter way to write functions.

• Single parameter: x => x * x
• Zero parameters: () => "Hello"
• Multi-line: Use curly braces and the return keyword.

5. Immediately Invoked Function Expression (IIFE) This function runs the moment you define it. It does not wait for a call. Example: (function() { console.log("I run!"); })();

6. Callback Functions A callback is a function passed into another function as an argument.

Synchronous Callbacks: The code runs in order. One task finishes before the next starts.

Asynchronous Callbacks: The code does not wait. JavaScript starts a task and moves to the next line. It runs the callback when the task finishes. Example: setTimeout() uses a callback to run code after a timer.

Think of a food order. You order food. The restaurant prepares it. They call your number when it is ready. The phone call is your callback.

Source: https://www.geeksforgeeks.org/javascript/functions-in-javascript/ Source: https://www.w3schools.com/js/js_callback.asp

Full post: https://dev.to/ezhil_abinayak_e38eec8fb/types-of-functions-in-javascript-3lhl