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closure.js
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57 lines (51 loc) · 1.59 KB
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// ==== Challenge 1: Write your own closure ====
// Write a simple closure of your own creation. Keep it simple!
hello = "Hello"
function Greet(param){
greeting = param;
console.log(greeting);
function Introduction(){
console.log(`${greeting}, my name is Dan`);
}
Introduction();
}
Greet(hello);
// ==== Challenge 2: Create a counter function ====
function counter(){
let count = 0;
//console.log("Counter activated");
function incrementer(){
//console.log("Incrementer activated");
return ++count;
}
return incrementer;
}
const newCounter = counter();
console.log(newCounter());
console.log(newCounter());
console.log(newCounter());
console.log(newCounter());
console.log(newCounter());
/* 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.
let count = 0;
IncDecrementer = {
incrementer: function(){
return ++count;
},
decrementer: function(){
return --count;
}
}
return IncDecrementer;
};
const diffCounter = counterFactory();
console.log(diffCounter.incrementer());
console.log(diffCounter.incrementer());
console.log(diffCounter.incrementer());
console.log(diffCounter.decrementer());
console.log(diffCounter.decrementer());