What is a non-method-local var in Scala?

Question

In comments on the Scala Shell or Swim, Josh Suret calls non-method-local vars as the cause of the problems in the Scala code.

This page is Google’s only hit for the phrase non-method-local vars, so what does it mean and what is the problem?

+5

Duncan mcgregor May 05 '12 at 12:33

2 answers

-- , /. , , , scala . ( , Haskell, .) parrallel.

+3

T.Grottker 05 '12 16:21

aioobe · Accepted Answer · 2012-05-05T12:36:47+0000

A local method variable is a local variable declared in the method scope.

Therefore, the non-method-local variable must be a variable with a wider scope, such as the scope of the class.

I can’t say exactly why it can be said that they are problematic. Perhaps this is simply because they inject mutable state into objects.