scala assigning string and array of values -

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i'm trying assign string followed array of scores.

i defined categories

case class categoryscore(    //define category score class val food: int, val tech: int, val service: int, val fashion: int)

and mapped them keys string such name of product followed case class of scores.

var keywordscores:map[string, categoryscore] = map()    //keyword scores  keywordscores += ("amazon",categoryscore(1,9,1,4))     //tried add score string, not work

am missing here?

scala> keywordscores += ("amazon" -> categoryscore(1,9,1,4))

or (note parenthesis)

scala> keywordscores += (("amazon", categoryscore(1,9,1,4)))

the reason + defined +(kvs: (a, b)*): map[a, b], meaning can take number of (key,value) pairs, leading += (k,v) being ambiguous.

the a -> b notation removes ambiguity (and it's nicer read).


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