I understand, thanks simple smile

Hello All, Is there any link that describes Kotlin Collections?

i know that Kotlin use Java Collections, but i need to know which Java Collection that enrich with Kotlin stdlib.

I'm not sure I understand your question

oh i get it now. i read documentation and kotlin source https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/index.html

like

listOf

will product ImmutableList in Kotlin

nevermind with my question 😄

@jasoet-gdp: there isn't such a document. it's a clear lack. i have been thinking of writing one.

@jasoet-gdp, @mikehearn : by @defuera https://youtrack.jetbrains.com/issue/KT-10275

also I would be grateful for explaining the difference in a) purposes b)implementations

We do have such distinction between

Iterable

and

Sequence

to determine at compile time whether operations should be performed in eager or lazy fashion: most transforming operations on

Iterable

are eager, while on

Sequence

they are lazy. Having

Sequence

inheriting from

Iterable

might make overload resolution tricky and unpredictable.

Additionally, the extension methods on `Iterable`s are mostly inlined and don't produce additional class files

related to this, I noticed some collection extension methods like

zip

don't accept `Sequence`s, is this a temporary oversight or a deliberate design decision?

which one do you mean? https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/zip.html the sequence one or the iterable one?

I was referring to the iterable and array one, I didn't even notice the sequence one

the iterable extensions never take sequences as arguments, same the other way round

you'll need to convert one of them

Note that conversion from an

Iterable

to a

Sequence

and vice-versa is performed with lightweight wrappers

Iterable.asSequence

and

Sequence.asIterable

I just notices that clicking on the source link on https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/as-iterable.html will take you to the master branch

which is wrong for the sequence one

it should probably take you to the latest release tag

@kirillrakhman: yeah, it should ) /cc: @yole

To my last question about

Iterable

vs

Sequence

- does it really make sense to have methods like

all(predicate): Boolean

duplicated? https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/all.html

I am trying to support a feeling that

Iterable

and

Sequence

should not be so incompatible

yeah, we just need to add support for implicit conversions, and that’ll fix it

@yole: haha.

not funny

of course you do have a point

I was thinking about an explicit conversion:

sth.asSequence().pa.pa.r.a.m.asIterable().all()