JS: Get/Set Prototype

By Xah Lee. Date: . Last updated: .

Find Parent

You can use the following to find a object's parent:

Best to use Reflect.getPrototypeOf, and avoid using __proto__.

Set Parent

Note: when you change a object X's parent, all objects with X in prototype chain will be effected. This may have consequences you don't expect, because all property lookup goes thru prototype chain. Also, changing parent is a slow operation.

Best to avoid changing parent. Instead, create a new object with the parent you want.

[see JS: Create Object with Parent X]

Check If is in Prototype Chain

a.isPrototypeOf(b)

[see JS: Object.prototype.isPrototypeOf]

Show Prototype Chain

JS: Show Prototype Chain

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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