Could someone elaborate on where when I should be using Sequ kotlinlang #announcements

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Title

r

redrield

09/23/2018, 10:21 PM

Could someone elaborate on where/when I should be using Sequence<*> vs Collection<*>? IntelliJ has started giving me lints recommending that a call chain should use Sequence, but I'm still confused as to when I should use that. I know that Sequences are lazy and Collections are eager, but I'm not sure when to use either

v

Vladyslav Sitalo

09/23/2018, 10:34 PM

In your example, I don’t believe

toList

is necessary

To answer a more general question - sequence can potentially give you better results on long list of transformations/large collections.

A more general write-up: https://blog.kotlin-academy.com/effective-kotlin-use-sequence-for-bigger-collections-with-more-than-one-processing-step-649a15bb4bf

k

karelpeeters

09/23/2018, 10:41 PM

Explained here as well, under "Quick Fix to convert chains of collection functions into sequences": https://blog.jetbrains.com/kotlin/2018/09/kotlin-1-2-70-is-out/

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