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python/snippets/every.md

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+---
+title: Test if every list element is truthy
+type: snippet
+tags: [list]
+cover: walking
+dateModified: 2020-11-02T19:27:53+02:00
+---
+
+Checks if the provided function returns `True` for every element in the list.
+
+- Use `all()` in combination with `map()` and `fn` to check if `fn` returns `True` for all elements in the list.
+
+```py
+def every(lst, fn = lambda x: x):
+  return all(map(fn, lst))
+```
+
+```py
+every([4, 2, 3], lambda x: x > 1) # True
+every([1, 2, 3]) # True
+```