• • Enum#find(function)
  • • Element

e.find(f) returns the first element x of e such that f(x) returns true, consuming the enumeration up to and including the found element, or, returns null if no such element exists in the enumeration, consuming the whole enumeration in the search.

Since find consumes a prefix of the enumeration, it can be used several times on the same enumeration to find the next element.

• • Enum#iter(function)

e.iter(f) calls the function f with each element of e in turn. This consumes the enumeration.