Scala method syntax problem

Question

I am learning scala, and meet a little problem. I want to use the String method stripMargin as following. But I can not add parenthesis on this method. I remember that no-argument method's parenthesis is optional, so here why I can not add parenthesis ?

val str=""" hello world
    |" ANd soe"
    |" to world"""

println(str.stripMargin())  // won't compile
println(str.stripMargin)  // compiles successfully

Jean-Philippe Pellet · Accepted Answer · 2011-05-23 12:23:56Z

4

If the method without parameters in define with (), then writing () is optional. If the method is defined without (), then adding () is not allowed (or, rather, is interpreted as if you were calling apply() on the returned result).

Good practice recommends that a method without side effects be defined without (), and to keep () both at definition site and call site when it has side effects.

answered May 23, 2011 at 12:23

Jean-Philippe Pellet

60.1k23 gold badges178 silver badges241 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Scala method syntax problem

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related