ruby 的 Enumerable 方法_Ruby_编程开发_程序员俱乐部

c = IO.constants
c.grep(/SEEK/)         #=> [:SEEK_SET, :SEEK_CUR, :SEEK_END]
res = c.grep(/SEEK/) {|v| IO.const_get(v) }
res                    #=> [0, 1, 2]

array.public_methods.grep(/^each_(.*)$/){ puts $1}
#index
#with_index
#entry
#slice
#cons
#with_object