diff options
| -rw-r--r-- | mrbgems/mruby-enum-lazy/mrblib/lazy.rb | 9 | ||||
| -rw-r--r-- | mrbgems/mruby-enum-lazy/test/lazy.rb | 6 |
2 files changed, 15 insertions, 0 deletions
diff --git a/mrbgems/mruby-enum-lazy/mrblib/lazy.rb b/mrbgems/mruby-enum-lazy/mrblib/lazy.rb index 28cffdc03..b650072e2 100644 --- a/mrbgems/mruby-enum-lazy/mrblib/lazy.rb +++ b/mrbgems/mruby-enum-lazy/mrblib/lazy.rb @@ -42,6 +42,15 @@ class Enumerator } end + def to_enum(meth=:each, *args, &block) + lz = Lazy.new(self, &block) + lz.obj = self + lz.meth = meth + lz.args = args + lz + end + alias enum_for to_enum + def map(&block) Lazy.new(self){|yielder, val| yielder << block.call(val) diff --git a/mrbgems/mruby-enum-lazy/test/lazy.rb b/mrbgems/mruby-enum-lazy/test/lazy.rb index 422e0baeb..940d070e8 100644 --- a/mrbgems/mruby-enum-lazy/test/lazy.rb +++ b/mrbgems/mruby-enum-lazy/test/lazy.rb @@ -40,6 +40,12 @@ assert("Enumerator::Lazy laziness") do assert_equal [10,20], a.b end +assert("Enumrator::Lazy#to_enum") do + lazy_enum = (0..Float::INFINITY).lazy.to_enum(:each_slice, 2) + assert_kind_of Enumerator::Lazy, lazy_enum + assert_equal [0*1, 2*3, 4*5, 6*7], lazy_enum.map { |a| a.first * a.last }.first(4) +end + assert("Enumerator::Lazy#zip with cycle") do e1 = [1, 2, 3].cycle e2 = [:a, :b].cycle |