uid.js

/**
 * Generates a unique string for use as ID(s).
 * @summary Similar in concept to
 * <http://wiki.ecmascript.org/doku.php?id=strawman:names>.
 * 
 * The goals of this function are twofold:
 * 
 * - Provide a way to generate a string guaranteed to be unique when compared
 *   to other strings generated by this function.
 * - Make the string complex enough that it is highly unlikely to be
 *   accidentally duplicated by hand (this is key if you're using `ID`
 *   as a private/protected name on an object).
 * 
 * @example
 * var privateName = uid();
 * var o = { 'public': 'foo' };
 * o[privateName] = 'bar';
 * 
 * @returns A string with unique id.
 */
// Generate unique IDs for use as pseudo-private/protected names.
function uid() {
    let a = new Uint32Array(3);
    window.crypto.getRandomValues(a);
    return (performance.now().toString(36) + Array.from(a).map(
        A => A.toString(36)).join("")).replace(/\./g, "");
};