In python can pass a function into a method like so :
def reducer:
doStuff
run(reducer)
Is there a similar mechanism in Scala ? I could define a trait named reducer and implement a method. Then in run pass the name of the trait and then invoke the method ?
Yes, there is such thing:
def run(block: Unit => Unit) = {
println("entering run")
block()
println("exiting run")
}
def block() = println("I'm block")
run(block)
// entering run
// I'm block
// exiting run
Note that you may need to change signature of run:
def run(f: Int => Int) {
println("before call: 1, after call " + f(1))
}
def f(x: Int) = x + 1
run(f)
// before call: 1, after call 2
def block() = println("I'm block") if the only thing you're doing is passing it in. It's perfectly valid to say run(_ => println("I'm block")) and cut out the middleman. (I'm sure you know this, but our OP may not)