diff options
Diffstat (limited to 'mrbgems/mruby-hash-ext/mrblib/hash.rb')
| -rw-r--r-- | mrbgems/mruby-hash-ext/mrblib/hash.rb | 37 |
1 files changed, 35 insertions, 2 deletions
diff --git a/mrbgems/mruby-hash-ext/mrblib/hash.rb b/mrbgems/mruby-hash-ext/mrblib/hash.rb index a5f04e5e1..9da08dc3a 100644 --- a/mrbgems/mruby-hash-ext/mrblib/hash.rb +++ b/mrbgems/mruby-hash-ext/mrblib/hash.rb @@ -1,5 +1,8 @@ class Hash + # ISO does not define Hash#each_pair, so each_pair is defined in gem. + alias each_pair each + ## # call-seq: # hsh.merge!(other_hash) -> hsh @@ -22,7 +25,7 @@ class Hash # def merge!(other, &block) - raise "can't convert argument into Hash" unless other.respond_to?(:to_hash) + raise TypeError, "can't convert argument into Hash" unless other.respond_to?(:to_hash) if block other.each_key{|k| self[k] = (self.has_key?(k))? block.call(k, self[k], other[k]): other[k] @@ -33,7 +36,6 @@ class Hash self end - alias each_pair each alias update merge! ## @@ -160,4 +162,35 @@ class Hash end self end + + ## + # call-seq: + # hsh.key(value) -> key + # + # Returns the key of an occurrence of a given value. If the value is + # not found, returns <code>nil</code>. + # + # h = { "a" => 100, "b" => 200, "c" => 300, "d" => 300 } + # h.key(200) #=> "b" + # h.key(300) #=> "c" + # h.key(999) #=> nil + # + + def key(val) + self.each do |k, v| + return k if v == val + end + nil + end + + ## + # call-seq: + # hsh.to_h -> hsh or new_hash + # + # Returns +self+. If called on a subclass of Hash, converts + # the receiver to a Hash object. + # + def to_h + self + end end |