Learn JavaScript: Objects: Learn JavaScript: Objects Cheatsheet | Codecademy

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• built-in data type for storing key-value pairs.

• the value of undefined will be returned by default.

• even when they are declared as const.

• the reference to the object,

• cannot be changed.

• they are passed by reference, not by value.

• the object itself (not a copy) is accessible and mutable (can be changed) inside that function.

• not private or protected.

• no way to fully prevent incorrect interactions with object properties.

• use getter and setter methods.

• the internal value is stored as a property with an identifier that matches the getter and setter method names, but begins with an underscore (_).

• using anonymous arrow function expressions, or with shorthand method syntax.

• The number of variables can be less than the total properties of an object.

• JavaScript arrow functions do not have their own this context, but use the this of the surrounding lexical context.

• Since data does not exist in the global context, accessing this.data returns undefined.

• allow for additional actions to be performed before these changes go into effect.

• returns an object is known as a factory function.

• accept parameters in order to customize the returned object.