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How to check if the variable is undefined in JavaScript



253 views
asked Jan 26, 2021 by avibootz
retagged Jun 3, 2025 by avibootz
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1 Answer

0 votes 
let n;
 
if (typeof n === 'undefined') {
  	console.log('undefined');
}
 
   
     
     
/*
run:
     
"undefined"
     
*/

 



answered Jan 26, 2021 by avibootz
edited Jan 26, 2022 by avibootz

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