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# getting-started

[Slackbot]

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[thana]

Cache<> doesn't exist in kotlin you need to specify the types inside the brackets

[cedric]

Also don’t call your own interface Cache as well.

[Amir Gur]

1. Remove the <> from : Cache<>
2. Add : Void otherwise won't compile:
- fun put(key: K, value: V) : Void
- fun evict(key: K) : Void

[Amir Gur]

Mind that Spring's Cache isn't generic thus no <>, or <K, V> are allowed after : Cache.
For instance you could extend a generic one this way: interface Cache<K, V> : javax.cache.Cache<K,V> { ... }

[Tuang]

thank you all,

[Tuang]

by the way, what does this means registrar: (key: K) -> V?)

In the following function
fun getOrPut(key: K, fun getOrPut(key: K, registrar: (key: K) -> V?): V?: V?

i thinks registrar is something likes the arguments name, so what are the rest?
is it a lambda ?

[thana]

(key: K) -> V?) is the signature of a lambda type, yes (yet, the key could be avoided, so it's pretty much the same like (K) -> V?)

[Tuang]

thanks @thana