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snippets/python/s/bifurcate-by.md

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+---
+title: Bifurcate list based on function
+type: snippet
+language: python
+tags: [list]
+cover: two-flower-vases
+dateModified: 2020-11-02T19:27:07+02:00
+---
+
+Splits values into two groups, based on the result of the given filtering function.
+
+- Use a list comprehension to add elements to groups, based on the value returned by `fn` for each element.
+- If `fn` returns a truthy value for any element, add it to the first group, otherwise add it to the second group.
+
+```py
+def bifurcate_by(lst, fn):
+  return [
+    [x for x in lst if fn(x)],
+    [x for x in lst if not fn(x)]
+  ]
+```
+
+```py
+bifurcate_by(['beep', 'boop', 'foo', 'bar'], lambda x: x[0] == 'b')
+# [ ['beep', 'boop', 'bar'], ['foo'] ]
+```