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Tags

#odersky-programming-in-scala-2ed #scala

Question

In this code you pass in a zero-arg function to delay evaluation; how would you rewrite it to use by-name parameters?


def myAssert(predicate: () => Boolean) =
  if (!predicate())
    throw new AssertionError
    
myAssert(() => 5 > 3)

Answer

change type () => Boolean to => Boolean:
def myAssert(predicate: => Boolean) =
  if (!predicate())
    throw new AssertionError

myAssert(5 > 3)

Tags

#odersky-programming-in-scala-2ed #scala

Question

In this code you pass in a zero-arg function to delay evaluation; how would you rewrite it to use by-name parameters?


def myAssert(predicate: () => Boolean) =
  if (!predicate())
    throw new AssertionError
    
myAssert(() => 5 > 3)

Answer

change type () => Boolean to => Boolean:
def myAssert(predicate: => Boolean) =
  if (!predicate())
    throw new AssertionError

myAssert(5 > 3)

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