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
88 lines (65 loc) · 2.24 KB
/
Copy pathcallbacks.js
File metadata and controls
88 lines (65 loc) · 2.24 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
88
// Create a callback function and invoke the 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:
function firstItem(arr, cb) {
return cb(arr[0]);
}
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)
}
// const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'];
// getLength(items, function(x) {
// console.log(x);
// })
function last(arr, cb) {
// last passes the last item of the array into the callback.
return cb(arr[arr.length-1])
}
// last(items, function(x) {
// console.log(x);
// })
function sumNums(x, y, cb) {
// sumNums adds two numbers (x, y) and passes the result to the callback.
return cb(x+y)
}
// sumNums(5, 2, function(x) {
// console.log(x);
// })
function multiplyNums(x, y, cb) {
// multiplyNums multiplies two numbers and passes the result to the callback.
return cb(x*y)
}
// multiplyNums(5, 2, function(x) {
// console.log(x);
// })
function contains(item, 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 list.includes(item) ? cb(true): cb(false)
}
// contains('book', items, function(x) {
// console.log(x);
// })
/* STRETCH PROBLEM */
function removeDuplicates(array, cb) {
// removeDuplicates removes all duplicate values from the given array.
// Pass the duplicate free array to the callback function.
// Do not mutate the original array.
// indexOf will find the first index of a given item. if there
// is a duplicate, indexOf result wont match the current index of the loop
let uniqueItems = array.filter((item, index) => array.indexOf(item) == index)
return cb(uniqueItems)
}
removeDuplicates([1, 2, 2, 3], function(x) {
console.log(x);
})