Babylon.js/src/Misc/guid.ts

/**
 * Class used to manipulate GUIDs
 */
export class GUID {
    /**
     * Implementation from http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript/2117523#answer-2117523
     * Be aware Math.random() could cause collisions, but:
     * "All but 6 of the 128 bits of the ID are randomly generated, which means that for any two ids, there's a 1 in 2^^122 (or 5.3x10^^36) chance they'll collide"
     * @returns a pseudo random id
     */
    public static RandomId(): string {
        return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
            var r = Math.random() * 16 | 0, v = c === 'x' ? r : (r & 0x3 | 0x8);
            return v.toString(16);
        });
    }
}