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pdf page 88 - 2nd edition

2 replies on 1 page. Most recent reply: Dec 21, 2010 10:07 PM by Jim Balter

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Douglas Viltrakis

Posts: 10
Nickname: douglasv
Registered: Aug, 2010

pdf page 88 - 2nd edition

Posted: Dec 21, 2010 10:46 AM

1)-def formatArgs(args: Array[String] = args.mkString("\n")
didn't work, type mismatch

2)- def formatArgs(args: Array[String]) = Array(args.mkString("\n")
did work
3) - assert(res == "zero\none\ntwo")
didn't work, not calling anything
4) - assert(res(0) == "zero\none\ntwo")
did work , calling first element, the string

George Berger

Posts: 24
Nickname: gcb
Registered: Jul, 2007

Re: pdf page 88 - 2nd edition

Posted: Dec 21, 2010 11:56 AM

There's a typo in your item 1:


  def formatArgs(args: Array[String] = args.mkString("\n")

should be:


  def formatArgs(args: Array[String]) = args.mkString("\n")

I cut-and-pasted the second statement from page 97 of the pdf.

That corrected version seems to work okay in the scala interpreter:


Welcome to Scala version 2.8.1.final (Java HotSpot(TM) Server VM, Java 1.5.0_16).
Type in expressions to have them evaluated.
Type :help for more information.

scala> def formatArgs(args: Array[String]) = args.mkString("\n")
formatArgs: (args: Array[String])String

scala> val res = formatArgs(Array("zero", "one", "two"))
res: String = 
zero
one
two

scala> assert(res == "zero\none\ntwo")

scala>

Jim Balter

Posts: 13
Nickname: jibal
Registered: Dec, 2010

Re: pdf page 88 - 2nd edition

Posted: Dec 21, 2010 10:07 PM

Douglas, you really should take more care in your submissions. It's page 98, not 88, and the code there is correct, whereas your (1) and (2) have syntax errors, and your (2) puts the resulting String in an Array, which is totally bogus, so it's no surprise that your (3) doesn't work.

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