JavaScript set boolean by separate conditions? -


i need design global boolean 2 conditions , b such if ever true, boolean true until b true, @ point boolean false. in other words, if becomes false boolean remains true.

i tried straightforward global variable became false when became false.

preferably javascript, pseudocode helpful.

this sounds xor. i.e. 

!a , !b == false , !b == true !a , b == true , b == false

unfortunately, javascript doesn't have logical xor operator, however

if( ? !b : b ) {

is functionally equivalent


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