use `unless` instead of `if not`.

3 files changed, 3 insertions, 3 deletions

diff --git a/mrbgems/mruby-enum-lazy/mrblib/lazy.rb b/mrbgems/mruby-enum-lazy/mrblib/lazy.rb
index b650072e2..8a7ac7fdc 100644
--- a/mrbgems/mruby-enum-lazy/mrblib/lazy.rb
+++ b/mrbgems/mruby-enum-lazy/mrblib/lazy.rb
@@ -69,7 +69,7 @@ class Enumerator
 
     def reject(&block)
       Lazy.new(self){|yielder, val|
-        if not block.call(val)
+        unless block.call(val)
           yielder << val
         end
       }
diff --git a/mrblib/string.rb b/mrblib/string.rb
index f91b5a23c..4c6114ecb 100644
--- a/mrblib/string.rb
+++ b/mrblib/string.rb
@@ -133,7 +133,7 @@ class String
     if args.length == 2 && block
       block = nil
     end
-    if !block
+    unless block
       replace = replace.to_str
     end
     result = []
diff --git a/test/assert.rb b/test/assert.rb
index 7efc24e19..8d96ff1cb 100644
--- a/test/assert.rb
+++ b/test/assert.rb
@@ -157,7 +157,7 @@ def assert_raise(*exp)
       msg = "#{msg}#{exp.inspect} exception expected, not"
       diff = "      Class: <#{e.class}>\n" +
              "    Message: #{e.message}"
-      if not exp.any?{|ex| ex.instance_of?(Module) ? e.kind_of?(ex) : ex == e.class }
+      unless exp.any?{|ex| ex.instance_of?(Module) ? e.kind_of?(ex) : ex == e.class }
         $mrbtest_assert.push([$mrbtest_assert_idx, msg, diff])
         ret = false
       end