base 62 encoding in ruby (versão funcional)
| ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" | |
| def base62_encode(num, alphabet=ALPHABET) | |
| base = alphabet.size | |
| char = ALPHABET[num%base,1] | |
| return char if num < base | |
| return char + base62_encode(num/base, alphabet) | |
| end | |
| def base62_decode(string, alphabet=ALPHABET) | |
| base = alphabet.size | |
| idx = alphabet.index(string[0..0]) | |
| return idx if string.size == 1 | |
| return idx + base62_decode(string[1..-1], alphabet) * base | |
| end | |
| puts base62_encode(0) | |
| puts base62_decode("0") | |
| puts base62_encode(128) | |
| puts base62_decode("1F3") | |
| puts base62_decode(base62_encode(128)) | |
| puts base62_encode(base62_decode("1F3")) |
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