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52 lines (43 loc) · 1.75 KB
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// ==== Challenge 1: Write your own closure ====
// Write a simple closure of your own creation. Keep it simple!
const cat = 'kittie';
function returnCat () {
let inside_variable = 'so much private';
let cat_variable = cat;
return cat_variable;
}
console.log(returnCat());
/* console.log(inside_variable); */ //is not defined bercause the variable in within the function scope
/* STRETCH PROBLEMS, Do not attempt until you have completed all previous tasks for today's project files */
// ==== Challenge 2: Create a counter function ====
const counter = () => {
// Return a function that when invoked increments and returns a counter variable.
let count = 0;
return function() {
return ++count;
}
};
const newCounter = counter();
console.log(newCounter()); // 1
console.log(newCounter()); // 2
// Example usage: const newCounter = counter();
// newCounter(); // 1
// newCounter(); // 2
// ==== Challenge 3: Create a counter function with an object that can increment and decrement ====
// doesn't work so far
/* const counterFactory = (param) => {
// 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 countObj = { counter: 0,
increment: function() {return this.counter +1},
decrement: function() {return this.counter -1},
};
return function(param) {
return param === 'increment' ? countObj.increment() : countObj.decrement();
}
};
const newCounterFactory = counterFactory();
console.log(newCounterFactory('increment')); // 1
console.log(newCounterFactory('increment')); // 2
console.log(newCounterFactory('decrement')); // 1 */