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Object.getOwnPropertySymbols() Method

Object.getOwnPropertySymbols(): Unveiling Hidden Properties

Previously, we discussed the Object.getOwnPropertyNames() method, which returns an array of all the enumerable properties of an object. Today, we're stepping into the realm of Object.getOwnPropertySymbols() — a method that reveals the hidden properties of objects.

What is Object.getOwnPropertySymbols() Method?

The Object.getOwnPropertySymbols() method returns an array of all the own property symbols of a given object.

Syntax of Object.getOwnPropertySymbols() Method


Where obj is the object whose own property symbols we want to retrieve.

Parameters of Object.getOwnPropertySymbols() Method

The Object.getOwnPropertySymbols() method takes a single parameter:

  • obj: The target object from which to retrieve the own property symbols.

Return Value of Object.getOwnPropertySymbols() Method

The Object.getOwnPropertySymbols() method returns an array of all the own property symbols of the given object.

If the object does not have any own property symbols, an empty array is returned.

Difference between Object.getOwnPropertySymbols() and Object.getOwnPropertyNames() Method

PropertyObject.getOwn PropertySymbols()Object.get OwnPropertyNames()
ReturnsOwn property symbolsOwn enumerable property names
Symbol PropertiesYesNo
Enumerable PropertiesNoYes

Use Cases of Object.getOwnPropertySymbols() Method

  • Inspecting the hidden properties of an object.
  • Reflecting on object properties.
  • Working with Symbol data type.

Code Example of Object.getOwnPropertySymbols() Method

const object = { firstName: "John", lastName: "Doe", [Symbol.for("age")]: 30 }; const symbols = Object.getOwnPropertySymbols(object); console.log(symbols); // [Symbol(age)]

Benefits of Using Object.getOwnPropertySymbols() Method

  • Allows access to hidden properties of an object.
  • Provides a way to work with Symbol data type.
  • Enables deeper object inspection and analysis.

Limitations of Object.getOwnPropertySymbols() Method

  • Does not return inherited property symbols.
  • Requires additional checks to handle non-object arguments.

Alternate Methods (if any) for Object.getOwnPropertySymbols() Method

There are no direct alternatives to the Object.getOwnPropertySymbols() method in JavaScript.

Best Practices for Using Object.getOwnPropertySymbols() Method

  • Use the method to inspect and analyze objects thoroughly.
  • Handle non-object arguments gracefully.
  • Be aware of the limitations and use the method accordingly.

Next Topic: Object.getPrototypeOf() Method

In our next session, we'll explore the Object.getPrototypeOf() method, which allows us to uncover the prototype of a given object and understand the inheritance chain.

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