strain: Add parameters to exercise placeholder to resolve #642

exercism · Nov 7, 2017 · 4f083db · 4f083db
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diff --git a/exercises/strain/README.md b/exercises/strain/README.md
@@ -9,7 +9,9 @@ For example, given the collection of numbers:
 
 - 1, 2, 3, 4, 5
 
-And the predicate:
+And the predicate: 
+
+Note: _a predicate P(x) will be true or false, depending on whether x belongs to a set._ [Wikipedia - Predicate](https://en.wikipedia.org/wiki/Predicate_(mathematical_logic)))
 
 - is the number even?
 

diff --git a/exercises/strain/strain.py b/exercises/strain/strain.py
@@ -1,6 +1,6 @@
-def keep():
+def keep(sequence, predicate):
     pass
 
 
-def discard():
+def discard(sequence, predicate):
     pass