22 lines
604 B
Markdown
22 lines
604 B
Markdown
---
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title: bifurcate_by
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tags: list,function,intermediate
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---
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Splits values into two groups according to a function, which specifies which group an element in the input list belongs to.
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If the function returns `True`, the element belongs to the first group; otherwise, it belongs to the second group.
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Use list comprehension to add elements to groups, based on `fn`.
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```py
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def bifurcate_by(lst, fn):
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return [
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[x for x in lst if fn(x)],
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[x for x in lst if not fn(x)]
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]
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```
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```py
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bifurcate_by(['beep', 'boop', 'foo', 'bar'], lambda x: x[0] == 'b') # [ ['beep', 'boop', 'bar'], ['foo'] ]
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```
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