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book, reversing

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Andrew Gaydenko

Posts: 8
Nickname: anli
Registered: Dec, 2007

book, reversing Posted: Dec 26, 2007 10:34 PM
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page 261:


1. def rev must be replaced with:

def rev[T](xs: List[T]): List[T] = xs match {
case List() => xs
case x :: xs1 => rev(xs1) ::: List(x)
}

2.

xs.reverse.init == xs.tail
xs.reverse.tail == xs.init

must be replaced with

xs.reverse.init == xs.tail.reverse
xs.reverse.tail == xs.init.reverse

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