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62 lines (56 loc) · 1.73 KB
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// ==== Challenge 1: Write your own closure ====
// Write a simple closure of your own creation. Keep it simple!
const closure = () => {
let candidClosure = 'begin';
const closeItOut = () => {
candidClosure = 'end';
return candidClosure;
}
return closeItOut;
}
console.log(closure());
const newCandid = closure();
console.log(newCandid())
// ==== Challenge 2: Create a counter function ====
const counter = () => {
// Return a function that when invoked increments and returns a counter variable.
let count = 0;
return () => {
return count++
}
} ;
// Example usage: const newCounter = counter();
// newCounter(); // 1
// newCounter(); // 2
const newCounter = counter();
const newCounterTest = counter();
console.log(newCounter());
console.log(newCounter());
console.log(newCounter());
console.log(newCounterTest());
/* 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;
let myObj = {
increment: () => {
count++
return count
},
decrement: () => {
count--
return count
}
}
return myObj
// 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 counterObj = counterFactory();
console.log(`${counterObj.increment()} test`);
console.log(counterObj.increment());
console.log(counterObj.increment());
console.log(counterObj.decrement());
console.log(counterObj.decrement());
console.log(counterObj.decrement());