blob: f866754a66acfeaf39d2ff524bf657072e856fa3 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
# frozen_string_literal: true
module GameOfLife
# Custom Plane class that represent a cyclic/circular plane/array
# This class would always return an element unless the array is empty
class Plane < Array
# Extending the default array behaviour by treating the array as cyclic/circular object
#
# @example working with normal array
# a = [0, 1, 2, 3]
# a[-6] == a[-2] == a[2]
# a[-5] == a[-1] == a[3]
# a[-4] == a[0] == a[4]
# a[-3] == a[1] == a[5]
# a[-2] == a[2] == a[6]
# a[-1] == a[3] == a[7]
# a[0] == a[4] == a[8]
#
# @example working with empty array
# b = []
# b[0] == b[1] == b[-1] == nil
def [](index)
return nil if empty?
super(index % size)
end
end
end
|
