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JavaScript Object.getOwnPropertySymbols() Method

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  • Last Updated : 27 Dec, 2022
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The Object.getOwnPropertySymbols() method in JavaScript is a standard built-in object which returns an array of all symbol properties that are present in a given object. An empty array is returned until symbol properties are set on the object.

Syntax: 

Object.getOwnPropertySymbols(obj)

Parameters: 

  • obj: This parameter is the object whose symbol properties are to be returned.

Return value: This method returns an array of all symbol properties that correspond to the properties found directly in the given object.

Below are some examples of this method 

Example 1: In this example, we will check for the symbol properties of the objects using the Object.getOwnPropertySymbols() Method in Javascript.

javascript




<script>
    const object1 = {};
    let vala = Symbol('geek1');
    let valb = Symbol.for('geek2');
      
    object1[vala] = 'localSymbol';
    object1[valb] = 'globalSymbol';
      
    const objectSymbols = Object.getOwnPropertySymbols(object1);
    console.log(objectSymbols.length);
      
    const object2 = {};  
    let a = Symbol('a');  
    let b = Symbol.for('b');  
    const objectSymbols1 = Object.getOwnPropertySymbols(object2);  
    console.log(objectSymbols1.length); 
</script>

Output: 

2
0

Example 2: In this example, we will check for the symbol properties of the objects using the Object.getOwnPropertySymbols() Method in Javascript.

javascript




<script>
    const object1 = {};
    let vala = Symbol('geek1');
    let valb = Symbol.for('geek2');
    let valc = Symbol.for('geek3');
      
    object1[vala] = 'localSymbol';
    object1[valb] = 'globalSymbol';
    object1[valc] = 'globalSymbol';
      
    const objectSymbols = Object.getOwnPropertySymbols(object1);
    console.log(objectSymbols.length);
    console.log(objectSymbols);      
    console.log(objectSymbols[0]);
    console.log(objectSymbols[2]);
    console.log(objectSymbols[1]);
</script>

Output: 

3
Array [Symbol(geek1), Symbol(geek2), Symbol(geek3)]
Symbol(geek1)
Symbol(geek3)
Symbol(geek2)

We have a complete list of Javascript Object methods, to check those please go through this JavaScript Object Complete Reference article.

Supported Browsers: 

  • Google Chrome 38 and above
  • Edge 12 and above
  • Firefox 36 and above
  • Opera 25 and above
  • Safari 9 and above

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