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saturov/Kotlin: classes 22

Created April 18, 2016 14:11
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Kotlin: classes 22
fun eval(expr: Expr): Double = when(expr) {
is Expr.Const -> expr.number
is Expr.Sum -> eval(expr.e1) + eval(expr.e2)
Expr.NotANumber -> Double.NaN
// ветка else не требуется, так как покрыты все возможные сценарии
}
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