How to get an array of unique values from an array containing duplicates in JavaScript?

Question

Given a `['0','1','1','2','3','3','3']` array, the result should be `['0','1','2','3']`.

Accepted Answer

Edited

ES6 solution:

```
[...new Set(a)];
```

Alternative:

```
Array.from(new Set(a));
```

Old response. O(n^2) (do not use it with large arrays!)

```
var arrayUnique = function(a) {
    return a.reduce(function(p, c) {
        if (p.indexOf(c) < 0) p.push(c);
        return p;
    }, []);
};
```

How to get an array of unique values from an array containing duplicates in JavaScript?

Solution

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