JS: Object.getOwnPropertyDescriptor

By Xah Lee. Date: . Last updated: .

Object.getOwnPropertyDescriptor(obj, key)

Return the attributes of property key of object obj. If the property doesn't exist, return undefined.

[see JS: Property Attributes, writable, enumerable, configurable]

If obj is not a object, it is first converted to a object type.

The return value is a property descriptor.

[see JS: Property Descriptor]

// get the attributes of a property
const x = {"p":4};
console.log( Object.getOwnPropertyDescriptor(x, "p") );
// → { value: 4, writable: true, enumerable: true, configurable: true }

Reflect.getOwnPropertyDescriptor

If using ES2015, you should use Reflect.getOwnPropertyDescriptor(obj, key) instead.

[see JS: Reflect.getOwnPropertyDescriptor]

Reference

ECMAScript® 2016 Language Specification#sec-object.getownpropertydescriptor

JS Object Property

  1. Property Overview
  2. Property Key
  3. Dot vs Bracket Notation
  4. Create/Delete Property
  5. Get/Set Property
  6. Check Property Existence
  7. Access Property
  8. List Properties
  9. Property Attributes
  10. Getter/Setter
  11. Property Descriptor
  12. Symbol

Object and Inheritance Topic

  1. JS: Object Overview
  2. JS: Object Type
  3. JS: Determine Type of Object
  4. JS: Object Literal Expression
  5. JS: Prototype and Inheritance
  6. JS: Create Object
  7. JS: Create Object with Parent X
  8. JS: Get/Set Prototype
  9. JS: Prevent Adding Property
  10. JS: Clone, Deep Copy Object/Array
  11. JS: Test Equality of Objects
  12. JS: Object Object
  13. JS: Object.prototype
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