How to get all indexes of a given element in an array?

Question

ruby

Is it possible to find out all indexes of a given element in an array? If so, how? I tried to solve this problem through the "index" method, but it returns the index only for the first element in the array. Thanks in advance for your reply.
Array example:
[ "|" , "a", "b", "|", "c," "d" , "f" , "|" , "|" ]
Example task
Get all indexes with value "|" .

Answer 1

l=["|", "a", "b", "|", "c," "d", "f", "|", "|"]
p l.each_index.select {|i| l[i]=="|"}

> [0, 3, 6, 7]