-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathobjects.js
More file actions
83 lines (75 loc) · 2.29 KB
/
Copy pathobjects.js
File metadata and controls
83 lines (75 loc) · 2.29 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
// Complete the following underscore functions.
// Reference http://underscorejs.org/ for examples.
const keys = (obj) => {
// Retrieve all the names of the object's properties.
// Return the keys as strings in an array.
// Based on http://underscorejs.org/#keys
return Object.getOwnPropertyNames(obj);
};
const values = (obj) => {
// Return all of the values of the object's own properties.
// Ignore functions
// http://underscorejs.org/#values
const array = [];
const keysArray = keys(obj);
for (let i = 0; i < keysArray.length; i++) {
array.push(obj[keysArray[i]]);
}
return array;
};
const mapObject = (obj, cb) => {
// Like map for arrays, but for objects. Transform the value of each property in turn.
// http://underscorejs.org/#mapObject
const keysArray = keys(obj);
const valueArray = values(obj);
for (let i = 0; i < keysArray.length; i++) {
obj[keysArray[i]] = cb(valueArray[i]);
}
return obj;
};
const pairs = (obj) => {
// Convert an object into a list of [key, value] pairs.
// http://underscorejs.org/#pairs
const keysArray = keys(obj);
const valueArray = values(obj);
const newArray = [];
for (let i = 0; i < keysArray.length; i++) {
const tempArray = [keysArray[i], valueArray[i]];
newArray.push(tempArray);
}
return newArray;
};
const invert = (obj) => {
// Returns a copy of the object where the keys have become the values and the values the keys.
// Assume that all of the object's values will be unique and string serializable.
// http://underscorejs.org/#invert
const keysArray = keys(obj);
const valueArray = values(obj);
const newObj = {};
for (let i = 0; i < keysArray.length; i++) {
newObj[valueArray[i]] = keysArray[i];
}
return newObj;
};
const defaults = (obj, defaultProps) => {
// Fill in undefined properties that match properties on the `defaultProps` parameter object.
// Return `obj`.
// http://underscorejs.org/#defaults
const keysArray = keys(defaultProps);
const valueArray = values(defaultProps);
for (let i = 0; i < keysArray.length; i++) {
if (Object.hasOwnProperty.call(obj, keysArray[i]) === false) {
obj[keysArray[i]] = valueArray[i];
}
}
return obj;
};
/* eslint-enable no-unused-vars */
module.exports = {
keys,
values,
mapObject,
pairs,
invert,
defaults
};