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56 lines (48 loc) · 1.46 KB
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// ==== Challenge 1: Write your own closure ====
// Write a simple closure of your own creation. Keep it simple!
const name = (name) => {
let firstName = name;
const sayHi = () => {
console.log(`Hi ${firstName}!`);
}
return sayHi;
}
const hiKendra = name("Kendra");
const hiJohn = name("John");
hiKendra();
hiJohn();
// ==== Challenge 2: Create a counter function ====
const counter = () => {
// Return a function that when invoked increments and returns a counter variable.
let count = 0;
const increment = () => {
console.log(++count);
}
return increment;
};
// Example usage:
const newCounter = counter();
newCounter(); // 1
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 = () => {
let count = 0;
const counterObject = {
increment: () => {
console.log(++count);
},
decrement: () => {
console.log(--count);
},
}
// 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.
return counterObject
};
const newerCounter = counterFactory();
newerCounter.increment();
newerCounter.increment();
newerCounter.increment();
newerCounter.decrement();