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Instead of adding several almost equal lines in a script we can use loops to perform a task like this. In JavaScript there are two different kind of loops: for - loops through a block of code a specified number of times. while - loops through a block of code while a specified condition is true.
A simpler workaround is to have two boolean variables. One will keep null/not-null and the other will keep true/false. An application of this: When you are caching a calculation in a boolean property, you need to know if it has been already set or not. e.g. This become useful in performance tuning when GetX() above is time consuming and IsX is accessed many times.