What is Module design pattern?

javascript

const Counter = (function() {
  // Private
  let count = 0;
  
  // Public API
  return {
    increment() {
      count++;
    },
    getCount() {
      return count;
    }
  };
})();

Counter.increment();
console.log(Counter.getCount()); // 1
console.log(Counter.count); // undefined - private!

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