Visually Optimizing JavaScript Conditional Operators that are stringed together -

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In Javascript we say we have the following code 

  var test = 'd '; If (test! = 'A' and test! = 'B' & test! = 'C') Warning ('was good to go');

It would be nice to type something like if looks too long for me 

  if (test! = ('A 'And' B 'and' A 'and' C ') Warning (' Good to go ');

Unfortunately this is not working. What is a great way? 

  var test = 'd'; if (! / [Abc ] /. Test (test) alerts ('was good to go');

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