30-seconds-of-code/snippets/every.md

title, tags

title	tags
every	list,function,intermediate

Returns True if the provided function returns True for every element in the list, False otherwise.

Iterate over the elements of the list to test if every element in the list returns True based on fn. Omit the seconds argument, fn, to check if all elements are True.

def every(lst, fn=lambda x: not not x):
  for el in lst:
    if not fn(x):
      return False
  return True

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