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Exporting a Class or Object

Exporting a Class or Object

Learn how to export a class or object in Node.js.

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Numerous modules in the Node.js ecosystem export only a single object aggregating all of the module’s functionality. To do so, they reassign the module.exports object instead of adding properties to it. For example, check out how the following module calculator.js is defined.

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// Declare a factory function that returns an object literal
const createCalc = () => {
  // The returned object has 4 methods
  return {
    add(x, y) {
      return x + y;
    },
    substract(x, y) {
      return x - y;
    },
    multiply(x, y) {
      return x * y;
    },
    divide(x, y) {
      return x / y;
    }
  };
};
// Export the factory function
module.exports = createCalc;

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