How to use RTree.filter method of io.kotest.property.RTreeout class

Best Kotest code snippet using io.kotest.property.RTreeout.RTree.filter

RTree.filter

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1fun RTree.filter(predicate: (T) -> Boolean): RTree {2    return when (this) {3        is RTree.Leaf -> if (predicate(value)) this else RTree.Empty4        is RTree.Node -> {5            val left = left.filter(predicate)6            val right = right.filter(predicate)7            when {8                else -> RTree.Node(left, right)9            }10        }11    }12}13fun RTree.filterNot(predicate: (T) -> Boolean): RTree {14    return filter { !predicate(it) }15}16fun <U> RTree.map(transform: (T) -> U): RTree {17    return when (this) {18        is RTree.Leaf -> RTree.Leaf(transform(value))19        is RTree.Node -> RTree.Node(left.map(transform), right.map(transform))20    }21}22fun <U> RTree.flatMap(transform: (T) -> RTree<U>): RTree {23    return when (this) {24        is RTree.Leaf -> transform(value)25        is RTree.Node -> RTree.Node(left.flatMap(transform), right.flatMap(transform))26    }27}28fun RTree.forEach(action: (T) -> Unit) {29    when (this) {30        is RTree.Leaf -> action(value)31        is RTree.Node -> {32            left.forEach(action)33            right.forEach(action)34        }35    }36}37fun <U> RTree.fold(initial: U, operation: (U, T) -> U): U {38    return when (this) {39        is RTree.Leaf -> operation(initial, value)40        is RTree.Node -> right.fold(left.fold(initial, operation), operation)41    }42}43fun <U> RTree.foldRight(initial: U, operation: (T, U) -> U): U {44    return when (this) {45        is RTree.Leaf -> operation(value, initial)46        is RTree.Node -> left.foldRight(right.foldRight(initial, operation), operation)47    }48}49fun RTree.all(predicate: (T) -> Boolean): Boolean {50    return when (this) {51        is RTree.Leaf -> predicate(value)52        is RTree.Node -> left.all(predicate) && right.all(predicate)53    }54}55fun RTree.any(predicate: (T)

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