What is Object.getOwnPropertySymbols() in Javascript?
The Object.getOwnPropertySymbols() method is used to return all the symbols of an object. getOwnPropertySymbols() is declared as follows:
Object.getOwnPropertySymbols(obj)
obj: The object whose symbols are required.
Return value
The getOwnPropertySymbols() method returns an array that contains all the symbols of the object obj.
Note: If an object has no symbols, the
getOwnPropertySymbols()method returns an empty array.
Browser compatibility
The getOwnPropertySymbols() method is supported by the following browsers:
- Edge
- Firefox
- Google Chrome
- Opera
- Safari
Example
Consider the code snippet below, which demonstrates the use of the getOwnPropertySymbols() method:
var obj = {}console.log("obj has symbols: ", Object.getOwnPropertySymbols(obj))var symbol1 = Symbol('Local Symbol')var symbol2 = Symbol.for('Global Symbol')obj[symbol1] = 'symbol 1 assigned to abj1'obj[symbol2] = 'symbol 2 assigned to abj2'console.log("obj has symbols: ", Object.getOwnPropertySymbols(obj))
Explanation
An object obj is declared in line 1. Initially, obj has no symbol, which is why calling the getOwnPropertySymbols() method in line 3 returns an empty array. Two symbols, symbol1 and symbol2, are created in line 5 and line 6, respectively. These two symbols are then assigned to obj in lines 8-9. After assigning two symbols to obj, the getOwnPropertySymbols() method is called again in line 11. An array is returned, containing the symbols symbol1 and symbol2 of obj.
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