23 lines
531 B
Markdown
23 lines
531 B
Markdown
---
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title: every
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tags: list,function,intermediate
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---
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Returns `True` if the provided function returns `True` for every element in the list, `False` otherwise.
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Iterate over the elements of the list to test if every element in the list returns `True` based on `fn`.
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Omit the seconds argument, `fn`, to check if all elements are `True`.
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```py
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def every(lst, fn=lambda x: not not x):
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for el in lst:
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if not fn(x):
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return False
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return True
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```
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```py
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every([4, 2, 3], lambda x: x > 1) # true
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every([1, 2, 3]) # True
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```
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