# 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[0]];
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[1],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

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

```const string = "foo";
const substring = "oo";

console.log(string.includes(substring));
```

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:

```var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);
```

Ref: https://bit.ly/3fFFgZv