forked from bloominstituteoftechnology/JavaScript-II
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathcallbacks.js
More file actions
87 lines (61 loc) · 2.04 KB
/
callbacks.js
File metadata and controls
87 lines (61 loc) · 2.04 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
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
console.log("The Callbacks start here")
// Create a higher order function and invoke the callback function to test your work. You have been provided an example of a problem and a solution to see how this works with our items array. Study both the problem and the solution to figure out the rest of the problems.
const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'];
/*
//Given this problem:
function firstItem(arr, cb) {
// firstItem passes the first item of the given array to the callback function.
}
// Potential Solution:
// Higher order function using "cb" as the call back
function firstItem(arr, cb) {
return cb(arr[0]);
}
// Function invocation
firstItem(items, function(first) {
console.log(first)
});
*/
function getLength(arr, cb) {
// getLength passes the length of the array into the callback.
return cb(arr.length);
}
getLength(items, function (length) {
console.log(length)
})
function last(arr, cb) {
// last passes the last item of the array into the callback.
return cb(arr[arr.length - 1])
}
last(items, function (last) {
console.log(last)
})
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
return cb(x + y);
//sumNums adds two numbers (x, y) and passes the result to the callback.
}
sumNums(12, 120, function (add) {
console.log(add)
});
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
return cb(x * y)
}
multiplyNums(3, 5, function (multiply) {
console.log(multiply)
});
function contains(list, cb) {
// contains checks if an item is present inside of the given array/list.
// Pass true to the callback if it is, otherwise pass false.
return cb(list.includes(items));
}
contains(items, function (check) {
console.log(check)
});
/* STRETCH PROBLEM */
function removeDuplicates() {
// removeDuplicates removes all duplicate values from the given array.
// Pass the duplicate free array to the callback function.
// Do not mutate the original array.
}