JavaScript checking null | Using equality operator

In JS null value means no value or absence of a value. Checking null in Javascript is easy, you can use the equality operator == or strict equality operator === (also called identity operator).

Examples of JavaScript checking null

Is the variable null? A code of Using equality operator to check null in JS.

Note:

See the MDN article on Equality comparisons and sameness for more detail.

Complete Example

Output:

JavaScript checking null

Q: Is there a standard function to check for null, undefined, or blank variables in JavaScript?

Answer: You can just check if the variable has a truthy value or not.

will evaluate to true if value is not:

  • null
  • undefined
  • NaN
  • empty string (“”)
  • 0
  • false

Q: What is the Type of null in JavaScript?

Answer: null has the 0 type tag, which corresponds to an object. The value null represents the intentional absence of any object value

Do comment if you have any doubts and suggestions on this question.

Note: The All JS Examples codes are tested on the Safari browser (Version 12.0.2) and Chrome.
OS: macOS 10.14 Mojave
Code: HTML 5 Version


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