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41 lines (35 loc) · 1.37 KB
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// ==== Challenge 1: Write your own closure ====
// Write a simple closure of your own creation. Keep it simple!
function top() {
let topVariable = "I am in top()";
//console.log(`Not able to access bottom() variable : ${bottomVariable}`); // will get an error bottomVariable is not defined.
function middle() {
let middleVariable = "I am in middle()";
function bottom() {
let bottomVariable = "I am in bottom()";
console.log(`bottom() :-- able to access top() and middle() variable because of closure \n ${topVariable} \n ${middleVariable}`);
}
bottom();
}
middle();
}
top();
// ==== Challenge 2: Create a counter function ====
const counter = (num = 0) => {
function count() {
num ++;
return num;
}
return count();
// Return a function that when invoked increments and returns a counter variable.
};
// Example usage:
//const newCounter = counter();
console.log(counter());
/* 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.
};