i - Index Of
Tags: array , number
This atom is dyadic, which means it takes two arguments.
Find the first index of
y in list
0 if the element is not present.
Automatically casts the left argument to a singleton list if needed. This takes the element on the right and the list on the left, which is opposite of
e (Occurs). If you want to check if an element exists in a list and want the list on the left, consider using this instead of
e - even though it returns the index and not a boolean value, since Jelly is 1-indexed,
0, the value returned if the element is not found, is the only falsy output, and thus indicates if the element is in the list.