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53 lines (45 loc) · 1.39 KB
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// ==== Challenge 1: Write your own closure ====
// Write a simple closure of your own creation. Keep it simple!
// IIFE
var myFunc = (function () {
var name = 'bob';
return function() {
console.log(name);
}
})();
myFunc();
// ==== Challenge 2: Create a counter function ====
const counter = () => {
// Return a function that when invoked increments and returns a counter variable.
let counter = 0;
return function () {
counter += 1;
return counter;
}
};
// Example usage:
// const newCounter = counter();
// console.log(newCounter()); // 1
// console.log(newCounter()); // 2
/* STRETCH PROBLEM, Do not attempt until you have completed all previous tasks for today's project files */
// ==== Challenge 3: Create a counter function with an object that can increment and decrement ====
const counterFactory = () => {
// Return an object that has two methods called `increment` and `decrement`.
// `increment` should increment a counter variable in closure scope and return it.
// `decrement` should decrement the counter variable and return it.
let counter = 0;
return {
increment() {
counter += 1;
return counter;
},
decrement() {
counter -= 1;
return counter;
}
}
};
const advCounter = counterFactory();
console.log(advCounter.increment()); // 1
console.log(advCounter.increment()); // 2
console.log(advCounter.decrement()); // 1