How do I check for an empty/undefined/null string in JavaScript? (3 SOLUTIONS!!)

How do I check for an empty/undefined/null string in JavaScript? (3 SOLUTIONS!!)

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Checking for an Empty, Null, or Undefined String
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Checking for an Empty, Null, or Undefined String

Checking for an Empty, Null, or Undefined String
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How to check for undefined variable in Javascript tutorial | How to handle Undefined
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Best Way to Check 'Null', 'Undefined' or 'Empty' in JavaScript
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