#scala
by adding the η-expansion postfix operator (η is pronounced "eta"), we can turn the method into a function value.
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tpolecat with `_' if you want to treat it as a partially applied function
val f = add1
^
Note also the type of add1, which doesn't look normal; you can't declare a variable of type (n: Int)Int. Methods are not values.
However, <span>by adding the η-expansion postfix operator (η is pronounced "eta"), we can turn the method into a function value. Note the type of f.
scala> val f = add1 _
f: Int => Int =
scala> f(3)
res0: Int = 4
The effect of _ is to perform the equivalent of the following: we construct a Function1 in Summary
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