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// ==== Challenge 1: Write your own closure ====
// Write a simple closure of your own creation. Keep it simple!
function first() {
let name = 'I am the first function';
console.log('This is from first function:', name);
function second() {
let sec = 'I am in the second function ';
console.log(sec);
function third() {
let lastFunc = 'I am the last one...';
console.log(lastFunc);
}
third();
}
second();
}
first();
/* STRETCH PROBLEMS, Do not attempt until you have completed all previous tasks for today's project files */
// Recursion?
// ==== Challenge 2: Create a counter function ====
const counter = () => {
// Return a function that when invoked increments and returns a counter variable.
let count = 1;
return function () {
return count++;
}
};
// Example usage: const newCounter = counter();
var newCounter = counter();
console.log(newCounter()); // 1
console.log(newCounter()); // 2
console.log(newCounter()); // 2
// ==== 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 count = 0;
return {
increment: function() {
return count++;
},
decrement: function() {
return count--;
}
};
};
let newCounterFactory = counterFactory();
newCounterFactory.increment(); // 1
newCounterFactory.increment(); // 2
newCounterFactory.increment(); // 3
newCounterFactory.decrement(); // 2
newCounterFactory.decrement(); // 1
newCounterFactory.decrement(); // 0