Add every snippet

snippets/every.md

@@ -0,0 +1,22 @@
+---
+title: every
+tags: 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`.
+
+```py
+def every(lst, fn=lambda x: not not x):
+  for el in lst:
+    if not fn(x):
+      return False
+  return True
+```
+
+```py
+every([4, 2, 3], lambda x: x > 1) # true
+every([1, 2, 3]) # True
+```