add methods product / sum

README.md

@@ -370,7 +370,7 @@ R.pluck('v1', [obj1, obj2]) # [1, 3]
 ```
 
 - [x] prepend
-- [ ] product
+- [x] product
 - [x] project
 
 ```python
@@ -422,7 +422,7 @@ R.slice(1, None, ['a', 'b', 'c', 'd']) # ['b', 'c', 'd']
 - [ ] splitWhenever
 - [ ] startsWith
 - [ ] subtract
-- [ ] sum
+- [x] sum
 - [ ] symmetricDifference
 - [ ] symmetricDifferenceWith
 - [x] T

ramda/__init__.py

@@ -58,6 +58,7 @@
 from .pipe import pipe
 from .pluck import pluck
 from .prepend import prepend
+from .product import product
 from .project import project
 from .prop import prop
 from .props import props
@@ -69,6 +70,7 @@
 from .reverse import reverse
 from .slice import slice
 from .sort import sort
+from .sum import sum
 from .T import T
 from .tail import tail
 from .toString import toString

ramda/product.py

@@ -0,0 +1,4 @@
+from .multiply import multiply
+from .reduce import reduce
+
+product = reduce(multiply, 1)

ramda/sum.py

@@ -0,0 +1,4 @@
+from .add import add
+from .reduce import reduce
+
+sum = reduce(add, 0)

test/test_product.py

@@ -0,0 +1,17 @@
+
+import unittest
+
+import ramda as R
+
+"""
+https://github.com/ramda/ramda/blob/master/test/product.js
+"""
+
+
+class TestT(unittest.TestCase):
+  def test_multiplies_together_the_array_of_numbers_supplied(self):
+    self.assertEqual(24, R.product([1, 2, 3, 4]))
+
+
+if __name__ == '__main__':
+  unittest.main()

test/test_sum.py

@@ -0,0 +1,21 @@
+
+import unittest
+
+import ramda as R
+
+"""
+https://github.com/ramda/ramda/blob/master/test/sum.js
+"""
+
+
+class TestSum(unittest.TestCase):
+  def test_adds_together_the_array_of_numbers_supplied(self):
+    self.assertEqual(10, R.sum([1, 2, 3, 4]))
+
+  def test_does_not_save_the_state_of_the_accumulator(self):
+    self.assertEqual(10, R.sum([1, 2, 3, 4]))
+    self.assertEqual(1, R.sum([1]))
+    self.assertEqual(25, R.sum([5, 5, 5, 5, 5]))
+
+if __name__ == '__main__':
+  unittest.main()