add method hasIn

README.md

@@ -237,9 +237,21 @@ R.equals(float('nan'), float('nan')) # True
 
 Similar to `hasPath`.
 
-- [ ] hasIn
-- [x] hasPath
+- [x] hasIn
+
+works for both dict and object
 
+```python
+class Obj:
+  def __init__(self, v):
+    self.v = v
+
+obj1 = Obj(1)
+R.hasIn('v', obj1) # True
+R.hasIn('v', {'v': 1}) # True
+```
+
+- [x] hasPath
 Support both dict and object.
 
 ```python

ramda/__init__.py

@@ -43,6 +43,7 @@
 from .gt import gt
 from .gte import gte
 from .has import has
+from .hasIn import hasIn
 from .hasPath import hasPath
 from .head import head
 from .identity import identity

ramda/hasIn.py

@@ -0,0 +1,12 @@
+from .isNil import isNil
+from .private._curry2 import _curry2
+from .private._has import _has
+
+
+def inner_hasIn(prop, obj):
+  if isNil(obj):
+    return False
+  return _has(obj, prop)
+
+
+hasIn = _curry2(inner_hasIn)

test/test_hasIn.py

@@ -0,0 +1,68 @@
+
+import unittest
+
+import ramda as R
+from ramda.private._isFunction import _isFunction
+
+"""
+https://github.com/ramda/ramda/blob/master/test/hasIn.js
+"""
+
+dictFred = {'name': 'Fred', 'age': 23}
+dictAnon = {'age': 99}
+
+
+class Fred:
+  def __init__(self, name, age):
+    self.name = name
+    self.age = age
+
+
+class Anon:
+  def __init__(self, age):
+    self.age = age
+
+
+fred = Fred('Fred', 23)
+anon = Anon(99)
+
+
+class TestHasInForDict(unittest.TestCase):
+  def test_returns_a_function_that_checks_the_appropiate_property(self):
+    nm = R.hasIn('name')
+    self.assertEqual(True, _isFunction(nm))
+    self.assertEqual(True, nm(dictFred))
+    self.assertEqual(False, nm(dictAnon))
+
+
+class TestHasInForObject(unittest.TestCase):
+  def test_returns_a_function_that_checks_the_appropiate_property(self):
+    nm = R.hasIn('name')
+    self.assertEqual(True, _isFunction(nm))
+    self.assertEqual(True, nm(fred))
+    self.assertEqual(False, nm(anon))
+
+  def test_checks_properties_from_parent(self):
+    class Person:
+      def __init__(self, name):
+        self.name = name
+
+    class Bob(Person):
+      def __init__(self, name, age):
+        super().__init__(name)
+        self.age = age
+    bob = Bob('Bob', 23)
+    self.assertEqual(True, R.hasIn('name', bob))
+
+
+class TestHasInForOthers(unittest.TestCase):
+  def test_works_properly_when_called_with_two_arguments(self):
+    self.assertEqual(True, R.hasIn('name', fred))
+    self.assertEqual(False, R.hasIn('name', anon))
+
+  def test_returns_false_when_non_existent_object(self):
+    self.assertEqual(False, R.hasIn('name', None))
+
+
+if __name__ == '__main__':
+  unittest.main()