1. function freezeProp(obj, prop) {
2.   Object.defineProperty(obj, prop, {configurable: false, writable: false});
3. }
4.  
5. function guidGenerator() {
6.   var S4 = function() {
7.     return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
8.   };
9.   return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());
10. }
11.  
12. class Thread {
13.   constructor() {
14.     this.id = guidGenerator();
15.     freezeProp(this, "id");
16.     this.stopped = false;
17.     this.running = false;
18.     this.runOnce = null;
19.     this.runConstantly = null;
20.     this.context = {};
21.   }
22.  
23.   set(runOnce, runConstantly) {
24.     this.runOnce = () => runOnce.apply(this.context);
25.     this.runConstantly = () => runConstantly.apply(this.context);
26.   }
27.  
28.   start() {
29.     if (!this.running) {
30.       const self = this.context;
31.  
32.       const delay = (ms) => new Promise(resolve => setTimeout(resolve, ms));
33.       self.delay = delay;
34.       self.id = this.id;
35.       self.dis = {};
36.       freezeProp(self, "id");
37.       freezeProp(self, "delay");
38.  
39.       const runConstantlyFunc = async () => {
40.         while (!this.stopped) {
41.           await this.runConstantly.apply(this.context);
42.           for (var member in self.dis) delete self.dis[member];
43.         }
44.       };
45.  
46.       if (this.runOnce != null) {
47.         (async () => {
48.           await this.runOnce.apply(this.context);
49.           if (this.runConstantly != null) {
50.             runConstantlyFunc();
51.           }
52.         })();
53.       } else if (this.runConstantly != null) {
54.         runConstantlyFunc();
55.       }
56.     } else {
57.       this.stopped = false;
58.     }
59.   }
60.  
61.   stop() {
62.     this.stopped = true;
63.   }
64. }