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on 21-Aug-2014 (Thu)

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Flashcard 149630506

Tags
#odersky-programming-in-scala-2ed #scala
Question
You can't reassign [vars or vals]
Answer
vals

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

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You can't reassign vals

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#odersky-programming-in-scala-2ed #scala
The only control structures in Scala are if, while, for, try, match, and function calls
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Flashcard 149630539

Tags
#odersky-programming-in-scala-2ed #scala
Question
How to write Unit as a literal?
Answer
()

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

pdf

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Flashcard 149630550

Tags
#odersky-programming-in-scala-2ed #scala
Question
Why doesn't it work?

var line = ""
while ((line = readLine()) != "") // This doesn’t work!
  println("Read: "+ line)

Answer
the result of assignment expression is always Unit, so the above check Unit != "" is always true

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

pdf

cannot see any pdfs