forked from bloominstituteoftechnology/JavaScript-II
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathclosure.js
More file actions
51 lines (46 loc) · 1.43 KB
/
closure.js
File metadata and controls
51 lines (46 loc) · 1.43 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
// ==== Challenge 1: Write your own closure ====
// Write a simple closure of your own creation. Keep it simple!
function addTwoOuter(x) {
let x = 1;
function addTwoInner() {
const addTwo = 2;
console.log(a + b);
}
return inner;
}
// ==== 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;
}
};
// Example usage:
const newCounter = counter();
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;
return {
increment: function () {
return ++count;
},
decrement: function () {
return --count;
},
value: function () {
return count;
}
};
}
const newStrechCounter = counterFactory();
console.log(newStrechCounter.value());
console.log(newStrechCounter.increment());
console.log(newStrechCounter.increment());
console.log(newStrechCounter.decrement());