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Test if every list element is truthy

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.

def every(lst, fn = lambda x: x):
  return all(map(fn, lst))

every([4, 2, 3], lambda x: x > 1) # True
every([1, 2, 3]) # True

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