29 lines
700 B
JavaScript
29 lines
700 B
JavaScript
// var alphabet = "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
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const alphabet = 'bMJZSrnxEyq8kN3UYQL5oXwV7BCFRtvpmDf1shAuHzKicTjeG29Pg4adW6';
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const base = alphabet.length;
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function encode(num) {
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let encoded = '';
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while (num) {
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const remainder = num % base;
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num = Math.floor(num / base);
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encoded = alphabet[remainder].toString() + encoded;
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}
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return encoded;
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}
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function decode(str) {
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let decoded = 0;
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while (str) {
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const index = alphabet.indexOf(str[0]);
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const power = str.length - 1;
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decoded += index * (Math.pow(base, power));
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str = str.substring(1);
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}
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return decoded;
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}
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module.exports.encode = encode;
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module.exports.decode = decode;
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