Create custom callbacks to achieve synchronous code execution

It seems that Dev Mode code runs synchronously... Otherwise I can't explain a bug that occurs only in production mode where the results are already there before a table has been cleaned to receive those new results and still has its outdated results. So both are mixed, although I call "cleanView()" before "getResults()". But this doesn't matter because JS runs asynchronously. So getResults() is executed before cleanView(). What I need is synchronous code execution, I need a callback.

How can achieve that getResults() will be only executed once clearView() has done its job? Basically I need to call getResults() in a clearView() callback.

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