@lancercomet/utils/dist/random.js

My personal utils lib.

/**
 * 生成随机整数.
 *
 * @param {number} [length=1] 整数长度, 最大 20.
 * @returns {number}
 */
function randomInt(length) {
    if (length === void 0) { length = 1; }
    if (length > 20) {
        length = 20;
    }
    var random = Math.random();
    if (random < 0.1) {
        random += 0.1;
    }
    return Math.floor(random * Math.pow(10, length));
}
/**
 * 从数组中随机取出一个成员.
 *
 * @export
 * @template T
 * @param {T[]} array
 * @returns {T}
 */
function randomItem(array) {
    return array[Math.floor(Math.random() * array.length)];
}
/**
 * 生成随机字符串.
 *
 * @param {number} [length=14] 字符串长度.
 * @returns {string}
 */
function randomString(length) {
    if (length === void 0) { length = 14; }
    var ROUND_STRING_LENGTH = 14;
    var round = Math.ceil(length / ROUND_STRING_LENGTH);
    var result = '';
    var createRandomString = function () {
        return (Date.now() * Math.ceil(Math.random() * 1000000))
            .toString(16)
            .substr(0, ROUND_STRING_LENGTH);
    };
    while (round > 0) {
        result += createRandomString();
        round--;
    }
    return result.substr(0, length);
}
export { randomInt, randomString, randomItem };