ruby - Is $< enumerable

Question

$< is used with map in the following code.

Is $< enumerable?

$<.map{|l|p (0..9).to_a.repeated_permutation(4).count{|m|m.inject(&:+)==l.to_i}}

Answer 1

是的。ARGF它是直接继承自Object并包含的别名Enumerable。