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36 lines
1.3 KiB
Kotlin
36 lines
1.3 KiB
Kotlin
package test.apicheck
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import kotlin.util.*
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import java.util.*
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trait Traversable<T> {
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/** Returns true if any elements in the collection match the given predicate */
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fun any(predicate: (T)-> Boolean) : Boolean
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/** Returns true if all elements in the collection match the given predicate */
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fun all(predicate: (T)-> Boolean) : Boolean
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/** Returns the first item in the collection which matches the given predicate or null if none matched */
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fun find(predicate: (T)-> Boolean) : T?
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/** Returns a new collection containing all elements in this collection which match the given predicate */
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// TODO using: Collection<T> for the return type - I wonder if this exact type could be
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// deduced somewhat from the This.Type; e.g. returning Set on a Set, Array on Array etc
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fun filter(predicate: (T)-> Boolean) : Collection<T>
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/** Performs the given operation on each element inside the collection */
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fun forEach(operation: (element: T)-> Unit)
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/** Returns a new collection containing the results of applying the given function to each element in this collection */
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fun <T, R> java.lang.Iterable<T>.map(transform : (T)-> R) : Collection<R>
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}
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/**
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TODO try use delegation here to make sure we implement all the methods in the Traversable API
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class ListImpl<T>(coll: ArrayList<out T>) : Traversable<T> by coll {
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}
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*/
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