[proposal] Persistent variables in functions/methods
neek.sandhu at outlook.com
Tue Jul 17 06:26:00 UTC 2018
Ok maybe you guys are impressed enough 😊
Here’s a 339 line file and [on Line 85 there’s a variable called `workerInitPromise`](https://github.com/NeekSandhu/v-thread/blob/ed350bd4dcbf8e368cea2b3819f405b61ef783a3/src/MainThread.ts#L85)
Only one method in that class is concerned with `workerInitPromise`, that is `startWorker()`
What is `workerInitPromise`?
Well, whenever [`startWorker()`](https://github.com/NeekSandhu/v-thread/blob/ed350bd4dcbf8e368cea2b3819f405b61ef783a3/src/MainThread.ts#L236) is called it should return a `Promise` that should resolve when the `Worker` is up and running.
That means one call to `startWorker` has started the worker startup sequence and it’d be wasteful to start it over again when someone else calls `startWorker`.
Instead `startWorker` decides to “share” the `Promise` amongst furious callers. Now, `startWorker` needs a place to store that `Promise` so he can share with subsequent callers.
Where is that place???
And that my friends is why I had to create `workerInitPromise` prop on the class, just to make `startWorker` happy.
It “belongs” in `startWorker` and should “live” inside `startWorker`
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