aaac7fed
 liuqimichale
add
|
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
|
[](https://travis-ci.org/fgnass/uniqs)
### Tiny utility to create unions and de-duplicated lists.
Example:
```js
var uniqs = require('uniqs');
var foo = { foo: 23 };
var list = [3, 2, 2, 1, foo, foo];
uniqs(list);
// => [3, 2, 1, { foo: 23 }]
```
You can pass multiple lists to create a union:
```js
uniqs([2, 1, 1], [2, 3, 3, 4], [4, 3, 2]);
// => [2, 1, 3, 4]
```
Passing individual items works too:
```js
uniqs(3, 2, 2, [1, 1, 2]);
// => [3, 2, 1]
```
### Summary
* Uniqueness is defined based on strict object equality.
* The lists do not need to be sorted.
* The resulting array contains the items in the order of their first appearance.
### About
This package has been written to accompany utilities like
[flatten](https://npmjs.org/package/flatten) as alternative to full-blown
libraries like underscore or lodash.
The implementation is optimized for simplicity rather than performance and
looks like this:
```js
module.exports = function uniqs() {
var list = Array.prototype.concat.apply([], arguments);
return list.filter(function(item, i) {
return i == list.indexOf(item);
});
};
```
### License
MIT
|
