Add Integer#positive? and Integer#negative? query methods in the vein of Fixnum#zero?

Author: David Heinemeier Hansson

activesupport/CHANGELOG.md

@@ -1,3 +1,8 @@
+*   Add Integer#positive? and Integer#negative? query methods in the vein of Fixnum#zero?
+    This makes it nicer to do things like bunch_of_numbers.select(&:positive?).
+
+    *DHH*
+
 *   Encoding ActiveSupport::TimeWithZone to YAML now preserves the timezone information.
 
     Fixes #9183.

activesupport/lib/active_support/core_ext/integer.rb

@@ -1,3 +1,4 @@
 require 'active_support/core_ext/integer/multiple'
 require 'active_support/core_ext/integer/inflections'
+require 'active_support/core_ext/integer/inquiry'
 require 'active_support/core_ext/integer/time'

activesupport/lib/active_support/core_ext/integer/inquiry.rb

@@ -0,0 +1,19 @@
+class Integer
+  # Returns true if the number is positive.
+  #
+  #   1.positive?  # => true
+  #   0.positive?  # => false
+  #   -1.positive? # => false
+  def positive?
+    self > 0
+  end
+
+  # Returns true if the number is positive.
+  #
+  #   -1.positive? # => true
+  #   0.positive?  # => false
+  #   1.positive?  # => false
+  def negative?
+    self < 0
+  end
+end

activesupport/test/core_ext/integer_ext_test.rb

@@ -27,4 +27,16 @@ def test_ordinal
     assert_equal 'st', 1.ordinal
     assert_equal 'th', 8.ordinal
   end
+
+  def test_positive
+    assert 1.positive?
+    assert_not 0.positive?
+    assert_not -1.positive?
+  end
+
+  def test_negative
+    assert -1.negative?
+    assert_not 0.negative?
+    assert_not 1.negative?
+  end
 end