General concepts

The warning sign indicates the element is not available.

The element starred as most useful.

Checks

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

Guards

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

Defines

Returns defined value from a method of an object.

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

Gets

Returns a value from an object.

Sets

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

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