How to check whether a variable is undefined or null in Javascript

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How to check whether a variable is undefined or null in Javascript

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  1. Technical Rajni
  2. How to check whether a variable is undefined or null in Javascript
  3. JavaScript Program To Check If A Variable Is undefined or null
  4. How to check if a variable is undefined in JavaScript?
  5. How can I determine if a variable is 'undefined' or 'null'?
  6. JavaScript: Check if Variable is undefined or null
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