Closures
Closures are functions that can capture the enclosing environment. For
example, a closure that captures the x variable:
|val| val + x
The syntax and capabilities of closures make them very convenient for on the fly usage. Calling a closure is exactly like calling a function. However, both input and return types can be inferred and input variable names must be specified.
Other characteristics of closures include:
- using
||instead of()around input variables. - optional body delimination (
{}) for a single expression (mandatory otherwise). - the ability to capture the outer environment variables.