How to get the nth element of an Enumerable in Ruby

Question

For example, to return the 10,000th prime number I could write:

require \'prime\'
Prime.first(10000).last #=> 104729

But creating a huge

Answer 1

What about this?

Prime.to_enum.with_index(1){|e, i| break e if i == 10000}
# => 104729

For enumerators that are not lazy, you probably want to put lazy on the enumerator.