Types of Functions in Javascript

bhattabbk

I am confused about function types in JS. How many types of functions do i need to know before i dive into the world of web development? basically, while going through you tube tutorials on JS,i found out several types of functions namely constructor functions and factory functions.
i wanted to know how many types of functions are there and what is the difference between them? do i need to learn every function in web development?

Nachfolger

bhattabbk How many types of functions do i need to know before i dive into the world of web development?

None. You need to know none. That's what the purpose of learning is, you dive head in and learn as you go. I think you're conflating function declaration vs what a function actually is. There's tons of different ways to define a function function xyz() {} or xyz = function() {} and this list can go on for quite some time. Stay basic, follow tutorials, and learn as you go.

bhattabbk do i need to learn every function in web development?

No. This would be impossible. A function is a programmer or language defined operation, you cannot simply learn every function in existence.

VITSUSA

bhattabbk click on the mentioned hyperlink to know about types of the functions in JavaScript -
https://dmitripavlutin.com/6-ways-to-declare-javascript-functions/#:~:text=In%20JavaScript%20functions%20are%20first,regular%20object%20of%20type%20function%20.&text=The%20arguments%20arg1%2C%20args2%2C%20.,as%20the%20function%20body%20code.

ravikumar11

There are three types of Functions available in JavaScript

Named function
Anonymous function
Immediately invoked function expression. It runs as soon as the browser finds it.

But, above as you said to dive in web development that means you are fresher in the technology industry. So, as a fresher, you don't need to know exactly all the functions in Javascript. I don't mean that you don't have to learn these functions but you can learn just there basics.

james____brown

Types of functions in JavaScript

A regular Function
Function Expression
Shorthand method definition
Arrow function
Generator function
New Function

rpg2009

In my opinion learning about the different function types, and we could throw in 'higher order functions' and 'recursive functions' to the list, is just the tip of the iceberg.

Look at almost any JS book or online course and there will be lengthy chapters/sections dedicated to functions. It's something that can be over-whelming to start with, and will take time, research and practice to try and grasp — Its all well worth the effort though.

If I think back a decade ago, and my efforts to wrap my head around JS functions, there are a few key things worth learning about.

Function invocation in general and the processes/steps involved in that. (see link below)
What the Execution context is
Arguments, the scope chain and lexical scoping
Garbage collection and 'closures'
The difference between arguments being passed as values or by reference — This definitely threw me to begin with.
Finally understanding that functions are basically executable objects (first class objects) that can be passed around and treated like any other piece of data.

https://blog.bitsrc.io/understanding-execution-context-and-execution-stack-in-javascript-1c9ea8642dd0

Personally I think with a good grounding in these topics, understanding different ways of creating and using functions will fall into place.

Just to add this was a link that helped me back then. Have to say it's pretty dry reading though.
http://jibbering.com/faq/faq_notes/closures.html