JS: Object.isSealed

JS: Object.isSealed

By Xah Lee. Date: . Last updated: .

Object.isSealed(obj)

Return true if object obj is sealed, else false.

[see JS: Object.seal]

[see JS: Prevent Adding Property]

const x3 = {};
console.log(Object.isSealed(x3)); // false
Object.seal(x3);
console.log(Object.isSealed(x3)); // true

Reference

ECMAScript® 2016 Language Specification#sec-object.issealed

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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