83 lines
2.1 KiB
JavaScript
83 lines
2.1 KiB
JavaScript
/**
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* Alphanumeric characters.
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* @const
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*/
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const ALPHANUM
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= '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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/**
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* Hexadecimal digit characters.
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* @const
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*/
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const HEX_DIGITS = '0123456789abcdef';
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/**
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* Generate a string with random alphanumeric characters with a specific length.
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*
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* @param {number} length - The length of the string to return.
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* @returns {string} A string of random alphanumeric characters with the
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* specified length.
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*/
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export function randomAlphanumString(length) {
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return _randomString(length, ALPHANUM);
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}
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/**
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* Get random element of array or string.
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*
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* @param {Array|string} arr - Source.
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* @returns {Array|string} Array element or string character.
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*/
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export function randomElement(arr) {
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return arr[randomInt(0, arr.length - 1)];
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}
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/**
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* Returns a random hex digit.
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*
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* @returns {Array|string}
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*/
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export function randomHexDigit() {
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return randomElement(HEX_DIGITS);
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}
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/**
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* Generates a string of random hexadecimal digits with a specific length.
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*
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* @param {number} length - The length of the string to return.
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* @returns {string} A string of random hexadecimal digits with the specified
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* length.
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*/
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export function randomHexString(length) {
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return _randomString(length, HEX_DIGITS);
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}
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/**
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* Generates random int within the range [min, max].
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*
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* @param {number} min - The minimum value for the generated number.
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* @param {number} max - The maximum value for the generated number.
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* @returns {number} Random int number.
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*/
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export function randomInt(min, max) {
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return Math.floor(Math.random() * (max - min + 1)) + min;
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}
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/**
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* Generates a string of random characters with a specific length.
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*
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* @param {number} length - The length of the string to return.
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* @param {string} characters - The characters from which the returned string is
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* to be constructed.
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* @returns {string} A string of random characters with the specified length.
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*/
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function _randomString(length, characters) {
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let result = '';
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for (let i = 0; i < length; ++i) {
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result += randomElement(characters);
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}
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return result;
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}
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