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October 10, 2021 10:45 am GMT
Original Link: https://dev.to/mhsohag11/answer-how-to-check-a-not-defined-variable-in-javascript-2bk2
Answer: How to check a not-defined variable in JavaScript
The only way to truly test if a variable is undefined is to do the following. Remember, undefined is an object in JavaScript.
if (typeof someVar === 'undefined') { // Your variable is undefined}Some of the other solutions in this thread will lead you to believe a variable
Original Link: https://dev.to/mhsohag11/answer-how-to-check-a-not-defined-variable-in-javascript-2bk2
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