How does Ruby's array work?

Question

When I input

p [[2,1],3,4][1][1]

It will output 1.

Why is that happening?

Answer 1

• [2,1] creates an array with two elements (2, 1)
• [[2,1],3,4] creates an array with three elements ([2,1], 3 and 4)
• [1] indexes that array and returns the second element 3 (indexing is 0 based)
• [1] indexes the second bit of the number 3 (represented in binary as 11) - aka 1