General concepts

The warning sign indicates the element is not available.

The element starred as most useful.


It's to check the provided value to be the same as expected.


It's a combination of both above, constrains the type of the parameter in the code editor, and checks its provided argument.


Returns defined value from a method of an object.

Defines new value in an object and returns a defined value.


Returns a value from an object.


Adds or updates an element with a specified key and a value to an object and returns an object.

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