https://lists.cs.princeton.edu/hyperkitty/list/chuck-dev@lists.cs.princeton.edu/thread/N3TXQQSJJ366YJIG7FEENA4IJI32IUOH/
instanceof operator - chuck-dev - lists.cs.princeton.edu
instanceof operatorchuckdevlistscs
https://javarevisited.blogspot.com/2015/12/10-points-about-instanceof-operator-in-java-example.html
How to use instanceof operator in Java with example
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https://www.w3schools.com/JSREF/jsref_oper_instanceof.asp
JavaScript instanceof Operator
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