add method forEach

README.md

@@ -1,6 +1,5 @@
 # python_ramda
 
-
 This is a repo try to copy <https://github.com/ramda/ramda> in python.
 
 [![linting: pylint](https://img.shields.io/badge/linting-pylint-yellowgreen)](https://github.com/PyCQA/pylint)
@@ -195,7 +194,7 @@ R.equals(float('nan'), float('nan')) # True
 - [ ] findLastIndex
 - [x] 0.1.2 flatten
 - [x] 0.1.2 flip
-- [ ] forEach
+- [x] forEach
 - [ ] forEachObjIndexed
 - [ ] fromPairs
 - [x] 0.1.2 groupBy

ramda/__init__.py

@@ -25,6 +25,7 @@
 from .find import find
 from .flatten import flatten
 from .flip import flip
+from .forEach import forEach
 from .groupBy import groupBy
 from .gt import gt
 from .gte import gte

ramda/forEach.py

@@ -0,0 +1,14 @@
+from .private._checkForMethod import _checkForMethod
+from .private._curry2 import _curry2
+
+
+def inner_forEach(fn, arr):
+  length = len(arr)
+  idx = 0
+  while idx < length:
+    fn(arr[idx])
+    idx += 1
+  return arr
+
+
+forEach = _curry2(_checkForMethod('forEach', inner_forEach))

test/test_forEach.py

@@ -0,0 +1,52 @@
+
+import unittest
+
+import ramda as R
+
+"""
+https://github.com/ramda/ramda/blob/master/test/forEach.js
+"""
+
+arr = [{'x': 1, 'y': 2}, {'x': 100, 'y': 200}, {'x': 300, 'y': 400}, {'x': 234, 'y': 345}]
+
+
+class TestForEach(unittest.TestCase):
+  def test_performes_the_passed_in_function_on_each_element_of_the_list(self):
+    sideEffect = {}
+
+    def fn(elem):
+      nonlocal sideEffect
+      sideEffect[elem['x']] = elem['y']
+    R.forEach(fn, arr)
+    self.assertEqual(sideEffect, {1: 2, 100: 200, 300: 400, 234: 345})
+
+  def test_returns_the_original_list(self):
+    s = ''
+
+    def fn(obj):
+      nonlocal s
+      s += str(obj['x'])
+    self.assertEqual(arr, R.forEach(fn, arr))
+    self.assertEqual(s, '1100300234')
+
+  def test_handles_empty_list(self):
+    self.assertEqual([], R.forEach(lambda x: x * x, []))
+
+  def test_dispatches_to_forEach_method(self):
+    dispatched = False
+
+    def fn():
+      return
+
+    class DummyList:
+      def forEach(this, callback):
+        nonlocal dispatched
+        dispatched = True
+        self.assertEqual(fn, callback)
+
+    R.forEach(fn, DummyList())
+    self.assertEqual(True, dispatched)
+
+
+if __name__ == '__main__':
+  unittest.main()