NodeJS : Javascript shorthand for calling a callback function if it is not null?

NodeJS : Javascript shorthand for calling a callback function if it is not null?

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NodeJS : Route.get() requires a callback function but got a [object Undefined]. What did I do wrong?
NodeJS : Route.get() requires a callback function but got a [object Undefined]. What did I do wrong?
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NodeJS : Route.get() requires a callback function but got a [object Undefined]. What did I do wrong?

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