nonce-fast/index.js

nonce value generator

'use strict';

const padStart = (string, targetLength, padString) => {
    const stringLength = string.length;
    if (stringLength == targetLength)
        return string;

    const stringDiffLength = targetLength - stringLength;
    let newString = '';
    for (let i = 1; i <= stringDiffLength; i++) {
        newString += padString;
    }

    return newString + string;
};

module.exports = (length) => {
    if (length == undefined || length < 1)
        length = 15;
    const maxValue = parseInt(padStart('', length, '9'));
    let repeat = 0,
        last;
    return () => {
        let nonce = Math.floor(Math.random() * maxValue);
        /* istanbul ignore if */
        if (nonce == last) {
            repeat++;
        } else {
            repeat = 0;
            last = nonce;
        }
        nonce += repeat;
        return padStart(`${nonce}`, length, '0');
    };
};