mruby · matz · Aug 11, 2026 · Aug 10, 2026 · Aug 10, 2026
@@ -498,7 +498,7 @@ def transpose
 
     column_count = nil
     self.each do |row|
-      raise TypeError unless row.is_a?(Array)
+      raise TypeError unless Array === row
       column_count ||= row.size
       raise IndexError, 'element size differs' unless column_count == row.size
     end

@@ -43,7 +43,7 @@ module Comparable
   def clamp(min, max=nil)
 
     if max.nil?
-      if min.kind_of?(Range)
+      if Range === min
         max = min.end
         if !max.nil? && min.exclude_end?
           raise ArgumentError, "cannot clamp with an exclusive range"

@@ -80,7 +80,7 @@ def -@
   #   Complex(2, 3) <=> 1              #=> 1
   #
   def <=>(other)
-    return nil unless other.kind_of?(Numeric)
+    return nil unless Numeric === other
     self.to_f <=> other.to_f
   rescue
     nil

@@ -785,14 +785,14 @@ def to_h(&blk)
     if blk
       self.each do |v|
         v = blk.call(v)
-        raise TypeError, "wrong element type #{v.class} (expected Array)" unless v.is_a? Array
+        raise TypeError, "wrong element type #{v.class} (expected Array)" unless Array === v
         raise ArgumentError, "element has wrong array length (expected 2, was #{v.size})" if v.size != 2
         h[v[0]] = v[1]
       end
     else
       self.each do |*v|
         v = v.__svalue
-        raise TypeError, "wrong element type #{v.class} (expected Array)" unless v.is_a? Array
+        raise TypeError, "wrong element type #{v.class} (expected Array)" unless Array === v
         raise ArgumentError, "element has wrong array length (expected 2, was #{v.size})" if v.size != 2
         h[v[0]] = v[1]
       end

@@ -133,7 +133,7 @@ def initialize(obj=NONE, meth=:each, *args, **kwd, &block)
   end
 
   private def initialize_copy(obj)
-    raise TypeError, "can't copy type #{obj.class}" unless obj.kind_of? Enumerator
+    raise TypeError, "can't copy type #{obj.class}" unless Enumerator === obj
     raise TypeError, "can't copy execution context" if obj.instance_eval{@fib}
     meth = args = kwd = fib = nil
     obj.instance_eval {
@@ -780,7 +780,7 @@ def chunk(&block)
         when last_value
           arr << element
         else
-          raise 'symbols beginning with an underscore are reserved' if value.is_a?(Symbol) && value.to_s[0] == '_'
+          raise 'symbols beginning with an underscore are reserved' if Symbol === value && value.to_s[0] == '_'
           y.yield [last_value, arr] if arr.size > 0
           last_value, arr = value, [element]
         end

@@ -17,7 +17,7 @@ class File < IO
   #   f = File.new("tmpfile",  "a")
   #
   def initialize(fd_or_path, mode = "r", perm = 0666)
-    if fd_or_path.kind_of? Integer
+    if Integer === fd_or_path
       super(fd_or_path, mode)
     else
       @path = fd_or_path

@@ -74,8 +74,8 @@ def max(&block)
     raise RangeError, "cannot get the maximum of endless range" if last.nil?
 
     # fast path for numerics
-    if val.kind_of?(Numeric) && last.kind_of?(Numeric)
-      raise TypeError if exclude_end? && !last.kind_of?(Integer)
+    if Numeric === val && Numeric === last
+      raise TypeError if exclude_end? && !(Integer === last)
       return nil if val > last
       return nil if val == last && exclude_end?
 
@@ -109,7 +109,7 @@ def min(&block)
     return val if last.nil?
 
     # fast path for numerics
-    if val.kind_of?(Numeric) && last.kind_of?(Numeric)
+    if Numeric === val && Numeric === last
       return nil if val > last
       return nil if val == last && exclude_end?
 
@@ -132,7 +132,7 @@ def min(&block)
   #   (1..5).overlap?(7..9) #=> false
   #
   def overlap?(other)
-    raise TypeError, "argument must be a range" unless other.kind_of?(Range)
+    raise TypeError, "argument must be a range" unless Range === other
 
     self_begin = self.begin
     other_end = other.end

@@ -42,7 +42,7 @@ def to_s
   #   Rational(1, 3) <=> 0.3             #=> 1
   #
   def <=>(other)
-    return nil unless other.kind_of?(Numeric)
+    return nil unless Numeric === other
     self.to_f <=> other.to_f
   rescue
     nil

@@ -12,7 +12,7 @@ class Addrinfo
   #
   def initialize(sockaddr, family=Socket::PF_UNSPEC, socktype=0, protocol=0)
     @hostname = nil
-    if sockaddr.is_a? Array
+    if Array === sockaddr
       sary = sockaddr
       if sary[0] == 'AF_INET' || sary[0] == 'AF_INET6'
         @sockaddr = Socket.sockaddr_in(sary[1], sary[3])
@@ -870,7 +870,7 @@ def accept_nonblock
   #   sock.bind(addrinfo)
   #
   def bind(sockaddr)
-    sockaddr = sockaddr.to_sockaddr if sockaddr.is_a? Addrinfo
+    sockaddr = sockaddr.to_sockaddr if Addrinfo === sockaddr
     Socket._bind(self.fileno, sockaddr)
     0
   end
@@ -885,7 +885,7 @@ def bind(sockaddr)
   #   sock.connect(addrinfo)
   #
   def connect(sockaddr)
-    sockaddr = sockaddr.to_sockaddr if sockaddr.is_a? Addrinfo
+    sockaddr = sockaddr.to_sockaddr if Addrinfo === sockaddr
     Socket._connect(self.fileno, sockaddr)
     0
   end
@@ -948,7 +948,7 @@ class UNIXSocket < BasicSocket
   #   UNIXSocket.new("/tmp/socket") { |s| s.write("data") }
   #
   def initialize(path, &block)
-    if self.is_a? UNIXServer
+    if UNIXServer === self
       super(path, "r")
     else
       super(Socket._socket(Socket::AF_UNIX, Socket::SOCK_STREAM, 0), "r+")

@@ -15,7 +15,7 @@ class String
   #   "%{foo}f" % { :foo => 1 }                 #=> "1f"
   #
   def %(args)
-    if args.is_a? Array
+    if Array === args
       sprintf(self, *args)
     else
       sprintf(self, args)

@@ -101,7 +101,7 @@ def lines(&blk)
   #     "07".upto("11").to_a  #=> ["07", "08", "09", "10", "11"]
   def upto(max, exclusive=false, &block)
     return to_enum(:upto, max, exclusive) unless block
-    raise TypeError, "no implicit conversion of #{max.class} into String" unless max.kind_of? String
+    raise TypeError, "no implicit conversion of #{max.class} into String" unless String === max
 
     len = self.length
     maxlen = max.length

@@ -40,7 +40,7 @@ def upcase
   # Case-insensitive version of `Symbol#<=>`.
 
   def casecmp(other)
-    return nil unless other.kind_of?(Symbol)
+    return nil unless Symbol === other
     lhs =  self.to_s; lhs.upcase!
     rhs = other.to_s.upcase
     lhs <=> rhs

@@ -30,7 +30,7 @@ def push(obj)
     def pop(non_block = false, timeout_ms: nil)
       unless timeout_ms.nil?
         raise ArgumentError, "timeout cannot be combined with non_block" if non_block
-        raise TypeError, "timeout_ms must be an Integer" unless timeout_ms.is_a?(Integer)
+        raise TypeError, "timeout_ms must be an Integer" unless Integer === timeout_ms
         raise ArgumentError, "timeout_ms must be non-negative" if timeout_ms < 0
       end
       deadline = timeout_ms.nil? ? nil : __deadline(timeout_ms)

@@ -59,7 +59,7 @@ def collect!(&block)
     idx = 0
     len = size
     while idx < len
-      self[idx] = block.call(self[idx])
+      self[idx] = yield(self[idx])
       idx += 1
     end
     self

@@ -25,7 +25,7 @@ module Enumerable
   # ISO 15.3.2.2.1
   def all?(&block)
     if block
-      self.each {|*val| return false unless block.call(*val)}
+      self.each {|*val| return false unless yield(*val)}
     else
       self.each {|*val| return false unless val.__svalue}
     end
@@ -42,7 +42,7 @@ def all?(&block)
   # ISO 15.3.2.2.2
   def any?(&block)
     if block
-      self.each {|*val| return true if block.call(*val)}
+      self.each {|*val| return true if yield(*val)}
     else
       self.each {|*val| return true if val.__svalue}
     end
@@ -60,7 +60,7 @@ def collect(&block)
     return to_enum(:collect) unless block
 
     ary = []
-    self.each {|*val| ary.push(block.call(*val))}
+    self.each {|*val| ary.push(yield(*val))}
     ary
   end
 
@@ -76,7 +76,7 @@ def detect(ifnone=nil, &block)
     return to_enum(:detect, ifnone) unless block
 
     self.each {|*val|
-      if block.call(*val)
+      if yield(*val)
         return val.__svalue
       end
     }
@@ -95,7 +95,7 @@ def each_with_index(&block)
 
     i = 0
     self.each {|*val|
-      block.call(val.__svalue, i)
+      yield(val.__svalue, i)
       i += 1
     }
     self
@@ -133,7 +133,7 @@ def find_all(&block)
 
     ary = []
     self.each {|*val|
-      ary.push(val.__svalue) if block.call(*val)
+      ary.push(val.__svalue) if yield(*val)
     }
     ary
   end
@@ -151,7 +151,7 @@ def grep(pattern, &block)
     self.each {|*val|
       sv = val.__svalue
       if pattern === sv
-        ary.push((block)? block.call(*val): sv)
+        ary.push((block)? yield(*val): sv)
       end
     }
     ary
@@ -231,7 +231,7 @@ def max(&block)
         flag = false
       else
         if block
-          result = val if block.call(val, result) > 0
+          result = val if yield(val, result) > 0
         else
           result = val if (val <=> result) > 0
         end
@@ -258,7 +258,7 @@ def min(&block)
         flag = false
       else
         if block
-          result = val if block.call(val, result) < 0
+          result = val if yield(val, result) < 0
         else
           result = val if (val <=> result) < 0
         end
@@ -289,7 +289,7 @@ def partition(&block)
     ary_T = []
     ary_F = []
     self.each {|*val|
-      if block.call(*val)
+      if yield(*val)
         ary_T.push(val.__svalue)
       else
         ary_F.push(val.__svalue)
@@ -310,7 +310,7 @@ def reject(&block)
 
     ary = []
     self.each {|*val|
-      ary.push(val.__svalue) unless block.call(*val)
+      ary.push(val.__svalue) unless yield(*val)
     }
     ary
   end

@@ -25,7 +25,7 @@ class Hash
   # ISO 15.2.13.4.8
   def delete(key, &block)
     if block && !self.has_key?(key)
-      return block.call(key)
+      return yield(key)
     end
     self.__delete(key)
   end
@@ -59,7 +59,7 @@ def each(&block)
     len = self.size
     i = 0
     while i < len
-      block.call([keys[i], vals[i]])
+      yield([keys[i], vals[i]])
       i += 1
     end
     self
@@ -87,7 +87,7 @@ def each(&block)
   def each_key(&block)
     return to_enum(:each_key) unless block
 
-    self.keys.each {|k| block.call(k)}
+    self.keys.each {|k| yield(k)}
     self
   end
 
@@ -112,7 +112,7 @@ def each_key(&block)
   def each_value(&block)
     return to_enum(:each_value) unless block
 
-    self.values.each {|v| block.call(v)}
+    self.values.each {|v| yield(v)}
     self
   end
 
@@ -148,7 +148,7 @@ def merge(*others, &block)
       i += 1
       raise TypeError, "Hash required (#{other.class} given)" unless Hash === other
       other.each_key {|k|
-        h[k] = (self.has_key?(k))? block.call(k, self[k], other[k]): other[k]
+        h[k] = (self.has_key?(k))? yield(k, self[k], other[k]): other[k]
       }
     end
     h
@@ -169,7 +169,7 @@ def reject!(&block)
 
     keys = []
     self.each {|k,v|
-      if block.call([k, v])
+      if yield([k, v])
         keys.push(k)
       end
     }
@@ -200,7 +200,7 @@ def reject(&block)
 
     h = {}
     self.each {|k,v|
-      unless block.call([k, v])
+      unless yield([k, v])
         h[k] = v
       end
     }
@@ -222,7 +222,7 @@ def select!(&block)
 
     keys = []
     self.each {|k,v|
-      unless block.call([k, v])
+      unless yield([k, v])
         keys.push(k)
       end
     }
@@ -253,7 +253,7 @@ def select(&block)
 
     h = {}
     self.each {|k,v|
-      if block.call([k, v])
+      if yield([k, v])
         h[k] = v
       end
     }