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Classes vs Plain Objects

Not everything needs a class. JavaScript’s plain objects are great for simple data. Use classes when you need shared behavior and multiple instances.

Plain objects​

  • Best for data containers, configuration, and one-off structures.
  • No methods required; just shape your data.
const userConfig = {
  theme: "dark",
  language: "en",
};

Classes​

  • Best for multiple instances that share behavior and manage state.
  • Encapsulate data + methods together.
class User {
  constructor(name) {
    this.name = name;
  }
  greet() {
    return `Hello, ${this.name}!`;
  }
}

Choosing the right tool​

  • Choose a plain object when:
    • You just need to group data.
    • There’s no shared behavior.
  • Choose a class when:
    • You need methods and state together.
    • You will create multiple similar instances.