I m just getting started with learning Kotlin and at the sam

Question

I m just getting started with learning Kotlin and at the same time I m trying to advance my functional programming understanding skills My background is in web development with JS using functional declarative libraries like Ramda and XState Is there a recommend learning path Books tutorials videos etc Thanks

pakoito · Answer

Oh that is a hard one Kotlin has one novel concept over JS which are scopes

pakoito · Answer

Scopes in JS could be broken if you remember you can reference `this` in any function and because of the lack of types it could call anything wherever at the callsite

pakoito · Answer

Kotlin fixes this by typing the `this` that you refer to This is used for both extension functions and lambdas

pakoito · Answer

that you ll need to read some info off the internet for There are a few explaining examples using helper functions like `let` or `apply`

pakoito · Answer

The rest is your standard OOP fare classes inheritance special syntax for fields and constructors patches for mutability such as lateinit

pakoito · Answer

You ll have to engage that part due to JVM integrations

pakoito · Answer

the bits that are somewhat different are first class `object` which is JS s equivalent of well an object stored in a variable

pakoito · Answer

`object Bla ` in Kotlin is `const Bla Bla = ` in JS

pakoito · Answer

class Bla object Ble could be Bla prototype Ble =

pakoito · Answer

the other one is sealed classes In Typescript you have unions in Kotlin you use inheritance to simulate unions

pakoito · Answer

but what if I want a union of something I don t define gt you wrap it in a class

pakoito · Answer

last one for class wrapping or your network POJOs you use `data class` It comes with some things you d expect to see by default in any class like structural equality and stable hashes

pakoito · Answer

those are hints to move to kotlin in general

pakoito · Answer

once you re familiar the FP bits are not much different from async await and any FP lib you ve used before

pakoito · Answer

map flatMap filter you know the works

pakoito · Answer

the <http arrow kt io|arrow kt io> docs could help you go through these and there are links to books and talks from people who ve taken this path before

dp · Answer

< pakoito> Amazing Thanks a ton for these tips and explanations A lot of the resources are more focused on explaining Kotlin to Java devs for obvious reasons so it s super helpful to hear about Kotlin from someone who is familiar with JS So I appreciate the time you put into these comments raised hands Arrow looks super interesting definitely going to try it out arrow