-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathfunctions.js
More file actions
49 lines (35 loc) · 1.8 KB
/
functions.js
File metadata and controls
49 lines (35 loc) · 1.8 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
// ==== Callbacks ====
/* Step 1: Create a higher-order function that accepts a callback
* Create a higher-order function named consume that can take 3 parameters.
* The first two parameters 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 (arg1, arg2, cb){
return cb(arg1,arg2);
}
/* 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!"
*/
const add = (num1, num2) => num1+num2;
const multiply = (num1, num2) => num1*num2;
const greeting = (fName, lName) => `Hello ${fName} ${lName}, nice to meet you!`
/* Step 3: Check your work by un-commenting 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: Nested function can access internal because it is in lexical scope of myFunction. Since nestedFunction is nested within myFunction and internal is looking to console log internal, it will look upward to the "kingdom" to see if the kingdom has it available for use....Closure.
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();