How do I scan every element of an array except one index?

Question

I'm using Ruby 2.4. How do I scan every element of an array for a condition except one index in the array? I tried this

arr.except(2).any? {|str| str.eql?("b")}

But got the following error:

NoMethodError: undefined method `except' for ["a", "b", "c"]:Array

but evidently what I read online about "except" is greatly exaggerated.

Answer 1

arr.reject.with_index { |_el, index| index == 2 }.any? { |str| str.eql?("b") }

Explanation:

arr = [0, 1, 2, 3, 4, 5]
arr.reject.with_index { |_el, index| index == 2 }
#=> [0, 1, 3, 4, 5]

Shortening what you are doing:

arr.reject.with_index { |_el, index| index == 2 }.grep(/b/).any?
#=> true

Following the @Cary's comment, another option would be:

arr.each_with_index.any? { |str, i| i != 2 && str.eql?("b") }