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March 13, 2016 04:02
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Convert Hex to Decimal
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| class Hex | |
| HEX = { '1' => 1, '2' => 2, '3' => 3, | |
| '4' => 4, '5' => 5, '6' => 6, | |
| '7' => 7, '8' => 8, '9' => 9, | |
| 'a' => 10, 'b' => 11, 'c' => 12, | |
| 'd' => 13, 'e' => 14, 'f' => 15 } | |
| attr_reader :string | |
| def initialize(input) | |
| @string = input.downcase | |
| end | |
| def to_decimal | |
| return 0 if string.match(/[^0-9a-f]/) | |
| string.split('').reverse | |
| .each_with_index.map { |character, index| HEX[character] * 16 ** index } | |
| .inject(&:+) | |
| end | |
| end | |
| result = Hex.new('abcde2342').to_decimal | |
| puts result |
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Nice. Is there a preference between
split('')andchars?