Lazy to read. Show me the code.
// 👶 How to explain closure to a 5 years old kid
/**
* Closure is like a candy factory
* You send the factory an order to make candies for you with your favorite flavor.
* The factory will pick the right expert for you,
* And it send back to you an expert's contact.
* Now whenever you need, you just call and submit the quantity.
* That expert will take care all the rest for you.
*/
const candyFactory = (flavor) => {
const experts = {
Chocolate: {
name: 'Tim',
secretRecipe: '🍫',
},
Strawberry: {
name: 'Alex',
secretRecipe: '🍓',
}
}
const expertByFlavor = experts[flavor];
return (quantity) => {
return `${quantity} ${flavor} candies are made
by ${expertByFlavor.name}.`;
}
}
// The factory doesn't want to send you their experts,
// Because it may leak their top secret recipe.
// Instead, they just send you a way to call the expert (as a function)
// and waiting for your calling to order anytime.
// Now the factory keeps your flavor and your expert.
// In conclusion:
// Only the inner function can access outer function'scope.
// Only the factory can directly tell the expert what to do.
const chocolateExpert = candyFactory('Chocolate');
const stawberryExpert = candyFactory('Strawberry');
console.log(chocolateExpert(1000));
// 1000 Chocolate candies are made by Tim.
console.log(stawberryExpert(500));
// 500 Strawberry candies are made by Alex.Try it at JSFiddle