# JavaScript: Bubble Sort algorithm

## JavaScript Function: Exercise-24 with Solution

Write a JavaScript function to apply Bubble Sort algorithm.

Note : According to wikipedia "Bubble sort, sometimes referred to as sinking sort, is a simple sorting algorithm that works by repeatedly stepping through the list to be sorted, comparing each pair of adjacent items and swapping them if they are in the wrong order".

Sample array: [12, 345, 4, 546, 122, 84, 98, 64, 9, 1, 3223, 455, 23, 234, 213]
Expected output: [3223, 546, 455, 345, 234, 213, 122, 98, 84, 64, 23, 12, 9, 4, 1]

Step by step pictorial presentation: Sample Solution: -

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>Bubble Sort algorithm</title>
<body>

</body>
</html>
```
```

JavaScript Code:

``````function bubble_Sort(a)
{
var swapp;
var n = a.length-1;
var x=a;
do {
swapp = false;
for (var i=0; i < n; i++)
{
if (x[i] < x[i+1])
{
var temp = x[i];
x[i] = x[i+1];
x[i+1] = temp;
swapp = true;
}
}
n--;
} while (swapp);
return x;
}

console.log(bubble_Sort([12, 345, 4, 546, 122, 84, 98, 64, 9, 1, 3223, 455, 23, 234, 213]));
```
```

Output:

```[3223,546,455,345,234,213,122,98,84,64,23,12,9,4,1]
```

Flowchart: Live Demo:

See the Pen javascript-function-exercise-24 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