JavaScript Interview Question #111

What are static methods and static fields in JavaScript classes?

Closures, Prototypes, Classes & Advanced Functions Mid-Level Intermediate

Quick Interview Answer

Static members belong to the class constructor itself rather than to individual instances. They are useful for utility behavior, factories, counters, configuration, or operations conceptually related to the class but not dependent on a particular instance.

Detailed Explanation

An instance does not access a static member through this in the same way it accesses an instance method.

Code Example

class MathHelper {
    static version = "1.0";

    static add(a, b) {
        return a + b;
    }
}

console.log(MathHelper.version);
console.log(MathHelper.add(2, 3));