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In what ways can a JavaScript object be considered false but remain not null?

asked 2023-07-17 00:59:01 +0000

plato gravatar image

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answered 2023-07-17 01:16:02 +0000

woof gravatar image

A JavaScript object can be considered false in the following ways but remain not null:

  1. If its boolean representation is false: An object's boolean value is typically true, but it can be false if it is a falsy object like an empty array or an object with no properties.

  2. If its length is 0: An object with a length property can be considered false if its length is 0. This is often the case with empty arrays.

  3. If it has a valueOf() or toString() method that returns a falsy value: An object with these methods can be considered false if the methods return a falsy value like 0, false, or '' (empty string).

  4. If it is explicitly compared to false: An object can also be considered false if it is explicitly compared to false using the === operator. However, this is not a common scenario.

In all of these cases, the object is still not null, but it can be evaluated as false in a boolean context.

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Asked: 2023-07-17 00:59:01 +0000

Seen: 19 times

Last updated: Jul 17 '23