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| 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 | 6x 18x 4x 14x 14x 1x 13x 13x 1x | /**
* Validates a given alphabet to match the following conditions:
* - alphabet is required
* - contains only alphanumeric characters
* - contains no duplicate characters
* @param {string} alphabet
*/
export const alphabetValidator = (alphabet) => {
if (!alphabet) {
throw new Error("Missing required parameter: alphabet");
}
const illegal = alphabet.match(new RegExp("[\\W_]"));
if (illegal) {
throw new Error(
`Illegal character found in alphabet: ${alphabet.charAt(illegal.index)}`
);
}
const duplicate = alphabet.match(new RegExp("(.+)(?=.*?\\1)", "g"));
if (duplicate) {
throw new Error(`Duplicate character found in alphabet: ${duplicate[0]}`);
}
};
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