# JavaScript: Find the second lowest and second greatest numbers from an array

## JavaScript Function: Exercise-11 with Solution

Write a JavaScript function which will take an array of numbers stored and find the second lowest and second greatest numbers, respectively.

Pictorial Presentation: Sample Solution: -

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset=utf-8 />
<title>Find the second lowest and second greatest numbers from an array</title>
<body>

</body>
```
```

JavaScript Code:

``````function Second_Greatest_Lowest(arr_num)
{
arr_num.sort(function(x,y)
{
return x-y;
});
var uniqa = [arr_num];
var result = [];

for(var j=1; j < arr_num.length; j++)
{
if(arr_num[j-1] !== arr_num[j])
{
uniqa.push(arr_num[j]);
}
}
result.push(uniqa,uniqa[uniqa.length-2]);
return result.join(',');
}

console.log(Second_Greatest_Lowest([1,2,3,4,5]));
```
```

Sample Output:

``` 2,4
```

Flowchart: Live Demo:

See the Pen JavaScript -Second lowest and second greatest numbers from an array-function-ex- 11 by w3resource (@w3resource) on CodePen.

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## JavaScript: Tips of the Day

Shorten an array using its length property

A great way of shortening an array is by redefining its length property.

```let array = [0, 1, 2, 3, 4, 5, 6, 6, 8, 9]
array.length = 4
// Result: [0, 1, 2, 3]
```

Important to know though is that this is a destructive way of changing the array. This means you lose all the other values that used to be in the array.

Ref: https://bit.ly/2LBj213