JavaScript Symbol species property specifies a function-valued property that the constructor function uses to create derived objects. With this, we can create a derived object.
Syntax:
[Symbol.species]
Property attributes: The species accessor property can be used to allow subclasses to override the default constructor for objects.
Return value: It returns a derived object.
Below examples illustrate the Symbol species property in JavaScript:
Example 1:
Javascript
class geek extends Array { Â Â Â Â static get[Symbol.species]() { Â Â Â Â Â Â Â Â return Array; Â Â Â Â } } Â Â const a = new geek(1, 2, 3, 4); const mapped = a.map((x) => 2); console.log(mapped instanceof geek); console.log(mapped instanceof geek); |
Output:
false false
Example 2:
Javascript
class geek extends Array { Â Â Â Â static get[Symbol.species]() { Â Â Â Â Â Â Â Â return Array; Â Â Â Â } } let a = new geek(1, 2, 3, 5, 7, 8); let mapped = a.map((x) => x); Â Â console.log(mapped instanceof geek); console.log(mapped instanceof Array); |
Output:
false true
Supported Browsers: The browsers supported by JavaScript Symbol species property are listed below:
- Google Chrome 51
- Firefox 50
- Edge 15
- Opera
- Apple Safari
We have a complete list of Javascript symbols’ properties and methods, to check those please go through the Javascript Symbol Complete Reference article.
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