17 lines
358 B
Scala
17 lines
358 B
Scala
class Stack[T] {
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private var items = List[T]()
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def isEmpty = items.isEmpty
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def peek = items match {
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case List() => error("Stack empty")
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case head :: rest => head
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}
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def pop = items match {
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case List() => error("Stack empty")
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case head :: rest => items = rest; head
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}
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def push(value: T) = items = value +: items
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}
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