76 lines
1.7 KiB
JavaScript
76 lines
1.7 KiB
JavaScript
/**
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* @const
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*/
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var ALPHANUM = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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/**
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* Generates random int within the range [min, max]
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* @param min the minimum value for the generated number
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* @param max the maximum value for the generated number
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* @returns random int number
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*/
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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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* Get random element from array or string.
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* @param {Array|string} arr source
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* @returns array element or string character
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*/
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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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* Generate random alphanumeric string.
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* @param {number} length expected string length
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* @returns {string} random string of specified length
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*/
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function randomAlphanumStr(length) {
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var result = '';
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for (var i = 0; i < length; i += 1) {
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result += randomElement(ALPHANUM);
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}
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return result;
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}
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/**
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* Generates random hex number within the range [min, max]
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* @param min the minimum value for the generated number
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* @param max the maximum value for the generated number
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* @returns random hex number
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*/
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function rangeRandomHex(min, max)
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{
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return randomInt(min, max).toString(16);
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}
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/**
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* Exported interface.
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*/
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var RandomUtil = {
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/**
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* Generates hex number with length 4
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*/
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random4digitsHex: function () {
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return rangeRandomHex(0x1000, 0xFFFF);
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},
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/**
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* Generates hex number with length 8
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*/
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random8digitsHex: function () {
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return rangeRandomHex(0x10000000, 0xFFFFFFFF);
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},
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/**
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* Generates hex number with length 12
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*/
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random12digitsHex: function () {
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return rangeRandomHex(0x100000000000, 0xFFFFFFFFFFFF);
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}
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};
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module.exports = RandomUtil;
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