Search for an Array element beginning at a given index
arrays, ruby
Solution
There is not an equivalent feature in Ruby.
You can search from the start of the array and forward to the end with `#index`, or search from the end of the array and go backward to the start with `#rindex`. To go from one arbitrary index to another, you have to first slice the array down to the indices of interest using array slices (for example with `#[]`) as the OP suggested.
Problem
In Python, you can specify start and end indices when searching for a list element: ``` >>> l = ['a', 'b', 'a'] >>> l.index('a') 0 >>> l.index('a', 1) # begin at index 1 2 >>> l.index('a', 1, 3) # begin at index 1 and stop before index 3 2 >>> l.index('a', 1, 2) # begin at index 1 and stop before index 2 Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: 'a' is not in list ``` Is there an equivalent feature in Ruby? You can use array slices, but that seems as though it would be less efficient, because of its requiring intermediate objects.