JavaScript의 클로저란 무엇입니까? (inute 가이드)

function outerFunction(outerVariable) {  
  return function innerFunction(innerVariable) {  
    console.log(`Outer: ${outerVariable}, Inner: ${innerVariable}`);  
  };  
}  

const myClosure = outerFunction("Hello");  
myClosure("World");  
// Output: Outer: Hello, Inner: World

function counter() {  
  let count = 0;  
  return function () {  
    count++;  
    return count;  
  };  
}  
const myCounter = counter();  
console.log(myCounter()); // 1
console.log(myCounter()); // 2  

function multiplyBy(multiplier) {  
  return function (number) {  
    return number * multiplier;  
  };  
}  
const double = multiplyBy(2);  
console.log(double(5)); // 10