random-unique-string.js

/**
 * Get a random large number
 */
export const getRandomNumber = () => parseInt((Math.random() + "").split('.')[1])

/**
 * Get random string identifier
 */
export const getRandomString = () => getRandomNumber().toString(36)

/**
 * Get a unique large random number
 */
export const getUniqueRandomNumber = () => (getRandomNumber() + Date.now())

/**
 * Get unique random string identifier
 */
export const getUniqueRandomString = () => getUniqueRandomNumber().toString(36)

random-unique-string.test.js

const sleep = (timeout = 0) => new Promise(resolve => setTimeout(() => resolve(), timeout))

async function main() {
    const cached = new Map()

    while (true) {
        const val = getUniqueRandomString()
        if (cached.has(val)) {
            console.warn('Found duplicated value', { size: cached.size, value: val })
            break
        }
        cached.set(val)
        console.log({ size: cached.size, value: val, length: val.length})
        await sleep(5)
    }
}

main()