JavaScript Program To Check If A Variable Is undefined or null | Celotek

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In this example, you will learn to write a JavaScript program that will check if a variable is undefined or null.

To understand this example, you should have the knowledge of the following JavaScript programming topics:

JavaScript null and undefined
JavaScript typeof Operator
JavaScript Function and Function Expressions

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  1. Celotek
  2. javascript
  3. undefined
  4. null
  5. method overloading
  6. Perform Function Overloading
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