ScalaMatsuri2017

val increment: Int => Int = n => n + 1 val double: Int => Int = n => n * 2 val composed = double.compose(increment) // or increment.andThen(double) composed(10) // => 22 object Calculator extends RegexParsers { def number = """\d+(\.\d*)?""".r ^^ { _.toDouble } def factor = number | "(" ~> expr <~ ")" def term = factor ~ rep( "*" ~ factor | "/" ~ factor) ^^ { case number ~ list => ... } def expr =

[d-hayashi]

moduler programming in scala