Parametric polymorphism: Difference between revisions
Added Kotlin
(→{{header|C sharp|C#}}: Fix compilation error in main program, cannot implicitly convert type BinaryTree<int> to type BinaryTree<U>) |
(Added Kotlin) |
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Line 594:
}
}</lang>
=={{header|Kotlin}}==
{{trans|C#}}
<lang scala>// version 1.0.6
class BinaryTree<T>(var value: T) {
var left : BinaryTree<T>? = null
var right: BinaryTree<T>? = null
fun <U> map(f: (T) -> U): BinaryTree<U> {
val tree = BinaryTree<U>(f(value))
if (left != null) tree.left = left?.map(f)
if (right != null) tree.right = right?.map(f)
return tree
}
fun showTopThree() = "(${left?.value}, $value, ${right?.value})"
}
fun main(args: Array<String>) {
val b = BinaryTree(6)
b.left = BinaryTree(5)
b.right = BinaryTree(7)
println(b.showTopThree())
val b2 = b.map { it * 10.0 }
println(b2.showTopThree())
}</lang>
{{out}}
<pre>
(5, 6, 7)
(50.0, 60.0, 70.0)
</pre>
=={{header|Mercury}}==
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