Search With Seek4Info.com
Welcome to collectivesolver - Programming & Software Q&A with code examples. A website with trusted programming answers. All programs are tested and work.

Contact: aviboots(AT)netvision.net.il

Semrush - keyword research tool

Turn ChatGPT, Claude, Gemini, And CoPilot Into Your Personal Assistant, Business Coach, Content Creator, And More

AFFILIATE MARKETING Your all-in-one performance engine Manage affiliates, creators, and customer referrals in one unified platform—turning every partnership into measurable growth
Secure & Reliable Web Hosting, Free Domain, Free SSL, 1-Click WordPress Install, Expert 24/7 Support

Boost your online presence with premium web hosting and servers

Most popular tags

python java c cpp c# javascript php vb# typescript nodejs go rust scala swift kotlin pascal html ruby dart r css vbnet bootstrap win32 groovy winapi sql mysql jquery pascal-string lua winforms kotlin-string bash c-string swift-string cpp-string go-string cobol c#-string php-string java-string vbnet-string rust-string python-string cpp-vector f# opengl scala-string javascript-string pascal-array swift-array typescript-string c-array php-array javascript-array rust-vector typescript-array python-list reactjs scala-array c-windows nodejs-string go-array kotlin-array nodejs-array sdl2 cpp-matrix cpp-array c#-list vbnet-list c-matrix pascal-matrix go-slice c#-array java-array nodejs-express character-code-ascii-unicode swift-matrix c#-matrix sdl3 angularjs transpose-matrix binary-search-algorithm dot-product-two-arrays generate-random-floating-point-numbers all-permutations-combinations kotlin-matrix typescript-matrix vbnet-array kotlin-list print-floyds-triangle case-insensitively-check-character-exists-in-string calculate-area-pentagon measure-function-execution-time sort-words-string exabyte-constant petabyte-constant terabyte-constant math-functions-constants
Disclosure: My content contains affiliate links.

42,192 questions

54,900 answers

573 users

How to check if the variable is undefined in Node.js



182 views
asked Jan 26, 2022 by avibootz
Share on
share on gp share on fb share on tw share on li share on re share via email

1 Answer

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

 



answered Jan 26, 2022 by avibootz

Related questions

1 answer 121 views
121 views
How to check if variable is null or undefined in Node.js
asked Jun 27, 2022 by avibootz
1 answer 125 views
125 views
How to set a variable value if undefined in Node.js
asked May 12, 2022 by avibootz
1 answer 169 views
169 views
How to check if variable is not equal multiple values in Node.js
asked Jun 24, 2022 by avibootz
2 answers 156 views
156 views
How to check if a variable is a string in Node.js
asked May 26, 2022 by avibootz
1 answer 125 views
125 views
How to check if a variable is of function type in Node.js
asked Jan 27, 2022 by avibootz
 | Search With Seek4Info.com
Powered by Question2Answer
...