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Javascript Object getOwnPropertySymbols() Method

Javascript Object getOwnPropertySymbols() Method with example on javascript, object, getOwnPropertySymbols(), getPrototypeOf(), defineProperties(), defineProperty(), entries(), freeze(), javascript tutorial, javascript array etc.

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JavaScript Object.getOwnPropertySymbols() Method

The Object.getOwnPropertySymbols() method returns an array of all symbol properties found directly upon a given object. This method returns an empty array unless you have set symbol properties on your object.

Syntax:

Object.getOwnPropertySymbols(obj)

Parameter

obj: It is an object whose symbol properties are to be returned.

Return value:

This method returns an array of all symbol properties found directly upon the given object.

Browser Support:

Chrome 38
Edge Yes
Firefox 36
Opera 35

Example 1

const object1 = {};
 a = Symbol('a');
 b = Symbol.for('b');
const objectSymbols = Object.getOwnPropertySymbols(object1);
console.log(objectSymbols.length);

Output:

0

Example 2

const object1 = {};
 a = Symbol('a');
 b = Symbol.for('b');
object1[a] = 'Carry';
object1[b] = 'Marry';
const objectSymbols = Object.getOwnPropertySymbols(object1);
console.log(objectSymbols.length);

Output:

2

Example 3

const object1 = {};
const a = Symbol('a');
const b = Symbol.for('b');
object1[a] = 'localSymbol';
object1[b] = 'globalSymbol';
const object2 = {};
const c = Symbol('c');
object2[c] = 'Carry';
const objectSymbols = Object.getOwnPropertySymbols(object1);
console.log(objectSymbols.length);

Output:

2

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