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fix bug in solution 4.3: use def not val in trait #74

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fix bug in solution 4.3: use def not val in trait #74

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4 changes: 2 additions & 2 deletions src/pages/traits/traits.md
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Original file line number Diff line number Diff line change
Expand Up @@ -282,8 +282,8 @@ sealed trait Rectangular extends Shape {
def width: Double
def height: Double
val sides = 4
override val perimeter = 2*width + 2*height
override val area = width*height
override def perimeter = 2*width + 2*height
override def area = width*height
}

case class Square(size: Double) extends Rectangular {
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