Refactor snippets

snippets/bifurcate.md

@@ -6,13 +6,13 @@ tags: list,intermediate
 Splits values into two groups. 
 If an element in `filter` is `True`, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group.
 
-- Use list comprehension and `enumerate()` to add elements to groups, based on `filter`.
+- Use list comprehension and `zip()` to add elements to groups, based on `filter`.
 
 ```py
 def bifurcate(lst, filter):
   return [
-    [x for i, x in enumerate(lst) if filter[i] == True],
-    [x for i, x in enumerate(lst) if filter[i] == False]
+    [x for x, flag in zip(lst, filter) if flag],
+    [x for x, flag in zip(lst, filter) if not flag]
   ]
 ```
 

snippets/chunk.md

@@ -15,7 +15,7 @@ from math import ceil
 def chunk(lst, size):
   return list(
     map(lambda x: lst[x * size:x * size + size],
-      list(range(0, ceil(len(lst) / size)))))
+      list(range(ceil(len(lst) / size)))))
 ```
 
 ```py

snippets/geometric_progression.md

@@ -14,7 +14,7 @@ Returns an error if `step` equals `1`.
 from math import floor, log
 
 def geometric_progression(end, start = 1, step = 2):
-  return [start * step ** i for i in range(0, floor(log(end/start) / log(step)) + 1)]
+  return [start * step ** i for i in range(floor(log(end/start) / log(step)) + 1)]
 ```
 
 ```py