JS: Object.prototype.propertyIsEnumerable

By Xah Lee. Date: . Last updated: .

obj.propertyIsEnumerable ( key )

Return true if value key is a own property key of the object obj and that property has enumerable attribute value of true. Else, false.

// check if a property is enumerable
const x4 = {"p":4};
console.log( x4.propertyIsEnumerable("p") ); // true
console.log( Object.getOwnPropertyDescriptor(x4, "p").enumerable ); // true

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

Reference

ECMAScript 2015 §Fundamental Objects#sec-object.prototype.propertyisenumerable

JS Object Property Topic

  1. JS: Property Overview
  2. JS: Property Key
  3. JS: Property Dot Notation / Bracket Notation
  4. JS: Create/Delete Property
  5. JS: Get Property, Set Property
  6. JS: Check Property Existence
  7. JS: Access Property
  8. JS: Property Attributes, writable, enumerable, configurable
  9. JS: Getter/Setter Properties
  10. JS: Property Descriptor

Object and Inheritance Topic

  1. JS: Object System Overview
  2. JS: What's Object?
  3. JS: Prototype and Inheritance
  4. JS: Create Object
  5. JS: Object Literal Expression
  6. JS: Find Object's Prototype
  7. JS: Set Object's Prototype
  8. JS: How to Create Object with Parent X?
  9. JS: Prevent Adding Property
  10. JS: Determine Type of Object
  11. JS: Primitive Value Object Wrapper
  12. JS: Clone, Deep Copy Object/Array
  13. JS: Test Equality of Objects

  1. JS: Object Object
  2. JS: Object.prototype
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