> For the complete documentation index, see [llms.txt](https://triplexlab.gitbook.io/vanilla-js/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://triplexlab.gitbook.io/vanilla-js/basics/07-array/07-3.-sort.md).

# 07-3. 배열내장 함수(sort)

배열 원소중에서 2번째로 큰 값 찾기 

```javascript
 <script>
    function getSecondBiggestNumber(arr) {
        // 코드를 작성하세요.
        arr.sort(function (x,y){return (x - y);});
        return(arr[arr.length-2])
    }

    // 테스트 코드
    console.log(getSecondBiggestNumber([4, 7, 2, 1, 9, 3, 6, 5]));
    console.log(getSecondBiggestNumber([80, 2, 44, 21, 92, 3, 51]));
    console.log(getSecondBiggestNumber([4, 7, 6, 5]));

</script>
```