{{jsSidebar("Classes")}}
The static keyword defines a static method for a class.
Syntax
static methodName() { ... }
Description
Static methods are called without instantiating their class and are also not callable when the class is instantiated. Static methods are often used to create utility functions for an application.
Examples
The following example demonstrates several things. It shows how a static method is implemented on a class and that a class with a static member can be subclassed. Finally it shows how a static method can and cannot be called.
class Triple { static triple(n) { n = n || 1; //should not be a bitwise operation return n * 3; } } class BiggerTriple extends Triple { static triple(n) { return super.triple(n) * super.triple(n); } } console.log(Triple.triple()); // 3 console.log(Triple.triple(6)); // 18 console.log(BiggerTriple.triple(3)); // 81 var tp = new Triple(); console.log(tp.triple()); // 'tp.triple is not a function'.
Specifications
Specification | Status | Comment |
---|---|---|
{{SpecName('ES6', '#sec-class-definitions', 'Class definitions')}} | {{Spec2('ES6')}} | Initial definition. |
{{SpecName('ESDraft', '#sec-class-definitions', 'Class definitions')}} | {{Spec2('ESDraft')}} |
Browser compatibility
{{CompatibilityTable}}
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | {{CompatChrome(42.0)}} | {{CompatGeckoDesktop(45)}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatUnknown}} |
Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|
Basic support | {{CompatNo}} | {{CompatGeckoMobile(45)}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatChrome(42.0)}} |