Im sure everyone else knows this, but i havent been able to google/ stackoverflow this: in

scope.launch{}

, what do you call those curly braces? I know the last parameter type seems to have to be a lambda, often called

block

I think it's a lambda? if it's not inline, syntactic sugar for an anonymous inner class

Yes, but i dont know what the curly braces mean. What can i call it? Its not a lambda, because it doesnt have

->

it's still a lambda, just without an argument and with a different receiver

just to be clear, those are not lambdas, but lambda types? 😂 i think i understand

yeah. I'm not 100% on the terminology but it's at least close. maybe someone else can chime in.

i cant believe theres only 3 upvotes on that stackoverflow question

it's a little weird that the top answer is talking about scope functions -- as far as I can tell, that's exclusively referring to let/also/apply/run/with. but any method can accept a lambda type that has a custom receiver

i think that answer is kinda wrong, because as you say,

this

is applicable to all functions that take a lambda with receiver, not just scope functions

Scope functions: There are five such functions included in the Kotlin standard library: 

apply

, 

run

, 

with

, 

let

, and 

also

.

https://kotlinlang.org/docs/reference/scope-functions.html Edit: Edited with official link

CoroutineScope.() -> Unit

is an example of the use of the optional receiver type (CoroutineScope in this example) with the block/function being called on the receiver as opposed to

(CoroutineScope) -> Unit

great confusing combo, trailing lambda with receiver. but it was basically the trailing lambda syntax that was confusing me

Pro tip, highly recommend having this handy https://kotlinlang.org/docs/kotlin-docs.pdf. You can skim the table of contents for something that sounds like what you're looking for, and discover things that you wouldn't otherwise 🙂

thanks @caelum19, i just read this 2 months later xD, skimming now