update insertion_sort

snippets/difference_by.md

@@ -1,17 +1,17 @@
-### difference_by
-
-Returns the difference between two list, after applying the provided function to each list element of both.
-
-Create a `set` by applying `fn` to each element in `b`, then use list comprehension in combination with fn on a to only keep values not contained in the previously created `set`.
-
-```python
-def difference_by(a, b, fn):
-    b = set(map(fn, b))
-    return [item for item in a if fn(item) not in b]
-```
-
-```python
-from math import floor
-difference_by([2.1, 1.2], [2.3, 3.4],floor) # [1.2]
-difference_by([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], lambda v : v['x']) # [ { x: 2 } ]
+### difference_by
+
+Returns the difference between two list, after applying the provided function to each list element of both.
+
+Create a `set` by applying `fn` to each element in `b`, then use list comprehension in combination with fn on a to only keep values not contained in the previously created `set`.
+
+```python
+def difference_by(a, b, fn):
+    b = set(map(fn, b))
+    return [item for item in a if fn(item) not in b]
+```
+
+```python
+from math import floor
+difference_by([2.1, 1.2], [2.3, 3.4],floor) # [1.2]
+difference_by([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], lambda v : v['x']) # [ { x: 2 } ]
 ```