-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathfunctions.js
More file actions
53 lines (41 loc) · 1.73 KB
/
functions.js
File metadata and controls
53 lines (41 loc) · 1.73 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
52
53
// ==== Callbacks ====
/* Step 1: Create a function that accepts a callback
* Create a function named consume that can take 3 parameters.
* The first two parameteres can accept any argument
* The last parameter accepts a callback
* In the body of the function return the callback with the two parameters that you created
*/
function consume(param1, param2, cb) {
return cb(param1, param2);
}
/* Step 2: Create several functions to callback with consume();
* Create a function named add that returns the sum of two numbers
* Create a function named multiply that returns the product of two numbers
* Create a function named greeting that accepts a first and last name and returns "Hello first-name last-name, nice to meet you!"
*/
function add(num1, num2) {
return num1 + num2;
}
function multiply(num1, num2) {
return num1 * num2;
}
function greeting(firstName, lastName) {
return `Hello ${firstName} ${lastName}, nice to meet you!`;
}
/* Step 3: Check your work by uncommenting the following calls to consume(): */
console.log(consume(2, 2, add)); // 4
console.log(consume(10, 16, multiply)); // 160
console.log(consume('Mary', 'Poppins', greeting)); // Hello Mary Poppins, nice to meet you!
// ==== Closures ====
// Explain in your own words why `nestedfunction()` can access the variable `internal`.
// Explanation: nestedfunction can access the variable internal because of lexical scope. So when invoked a closure is made that stores the value of the variable for nestedfunction to use.
const external = "I'm outside the function";
function myFunction() {
console.log(external);
const internal = "Hello! I'm inside myFunction!";
function nestedFunction() {
console.log(internal);
}
nestedFunction();
}
myFunction();