You are an expert code analysis AI. Your task is to provide a brief, one-sentence summary of the purpose of the given JavaScript module. Use the module's code as context. Input Module Code (moduleB): ```javascript /** * moduleB.js - Another sample module. */ export const add = (a, b) => { return a + b; }; export default class Calculator { constructor(initialValue = 0) { this.value = initialValue; } multiply(factor) { this.value *= factor; return this.value; } } ``` <> One-sentence Summary: