gistfile1.txt

[info] Starting scala interpreter...
[info] 
Welcome to Scala version 2.10.4 (OpenJDK 64-Bit Server VM, Java 1.6.0_32).
Type in expressions to have them evaluated.
Type :help for more information.

scala> def f = 1
def f = 1
f: Int

scala> f
f
res0: Int = 1

scala> f()
f()
<console>:9: error: Int does not take parameters
              f()
               ^

scala> (f _)
(f _)
res2: () => Int = <function0>

scala> (f _)()
(f _)()
res3: Int = 1

scala> def g() = 2
def g() = 2
g: ()Int

scala> g
g
res4: Int = 2

scala> g()
g()
res5: Int = 2

scala> (g _)
(g _)
res6: () => Int = <function0>

scala> (g _)()
(g _)()
res7: Int = 2

scala> val h = () => 3
val h = () => 3
h: () => Int = <function0>

scala> h
h
res8: () => Int = <function0>

scala> h()
h()
res9: Int = 3

scala> (h _)
(h _)
res10: () => () => Int = <function0>

scala> (h _)()
(h _)()
<console>:9: error: _ must follow method; cannot follow h.type
              (h _)()
               ^

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