How can I determine if a variable is 'undefined' or 'null'?

How can I determine if a variable is 'undefined' or 'null'?

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How to Check if Variable is Undefined or Null in Javascript
How to Check if Variable is Undefined or Null in Javascript
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How can I determine if a variable is 'undefined' or 'null'

How can I determine if a variable is 'undefined' or 'null'
How can I determine if a variable is 'undefined' or 'null'?

How can I determine if a variable is 'undefined' or 'null'?
How can I determine if a variable is 'undefined' or 'null'?

How can I determine if a variable is 'undefined' or 'null'?
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