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Nodejs Best Practice Exception Handling

I conscionable began making an attempt retired nodejs a fewer days agone Ive realized that the Node is terminated each time I person an unhandled objection

How do I check if a variable exists

I privation to cheque if a adaptable exists Present Im doing thing similar this attempt myVar but NameError Bash thing Are location another methods with out

Catch multiple exceptions at once

It is discouraged to drawback SchemeObjection errors Alternatively lone the identified exceptions ought to beryllium caught This typically leads to pointless