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Xiao Yang

Posts: 3
Nickname: xiao
Registered: Aug, 2011

Mutable Map += Posted: Sep 17, 2011 5:05 PM
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Hi,

On page 392:

import scala.collection.mutable.Map // only change needed!
var capital = Map("US" -> "Washington", "France" -> "Paris")
capital += ("Japan" -> "Tokyo")
println(capital("France"))

Should it work after changing var to val as the object which capital is referring to is mutable? It works if I replace the third line by capital + ("Japan" -> "Tokyo").

Thank you.
Xiao

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