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Bubble Sort Algorithm Javascript: Javascript Explained

The bubble sort algorithm is a sorting algorithm used to sort arrays and other sequential data structures. It is one of the most simple and widely used sorting algorithms—and it can be implemented on the popular scripting language Javascript. Understanding the bubble sort algorithm, and its implementation in Javascript, is key for anybody planning on sorting data quickly and efficiently. In this article, we will discuss what the bubble sort algorithm is, its advantages and drawbacks, how to implement the bubble sort algorithm in Javascript, and common pitfalls to watch out for when programming the code.

What is the Bubble Sort Algorithm?

The bubble sort algorithm is an algorithm used to sort sequential data structures such as arrays and linked lists. It is a type of sorting algorithm which takes the form of a ‘bubble’, where each element of the data structure is compared with the next element, in order. With each comparison, the elements are then ‘bubbled up’ in order. That is to say, if the first element is greater than the second, they are swapped in order until all elements are sorted in ascending (or descending) order.

The bubble sort algorithm works by making passes through the entire list, comparing adjacent elements and swapping them until no more swaps are necessary. Each pass through the list finds the largest (or smallest) element and ‘bubbles’ it to its correct position in the array or list. After each pass through the list, the largest element will be in its correct position. The algorithm proceeds to slowly ‘bubble up’ smaller and smaller elements with each pass until all elements have been properly positioned.

How Does the Bubble Sort Algorithm Work?

The working of bubble sort can be broken down into four simple steps. Firstly, it compares two adjacent elements of the array or list. If the first element is greater than the second, they are swapped. This step is repeated until all elements have been compared with their adjacent elements. Secondly, if a swap occurs, the algorithm then checks to see if any further swaps are necessary by making a pass through the list again, continuously swapping elements until no further swaps are required. Thirdly, if no swaps were made, then the algorithm assumes that the list is sorted and exits. Lastly, if a swap was made, the algorithm proceeds to look at all other elements until it finds another swap needing to be made.

Understanding the Concept of Bubble Sort Algorithm

To understand how bubble sort works, visualize a large container of items that needs to be placed into different rows or shelves. Instead of physically sorting each item into their predetermined rows or shelves, we can imagine a bubble slowly bubbling up from the bottom of the container and rising up until it reaches its desired position in the container; thus “bubbling” up each item to its correct row or shelf. This overall concept is used in the bubble sort algorithm for sorting items.

Benefits and Drawbacks of Using Bubble Sort Algorithm

The bubble sort algorithm has several advantages over other sorting algorithms such as Insertion and Quick Sort: it is simple to understand, it only takes one pass over the list of elements to figure out which elements require switching, and it can be coded easily in most programming languages.

On the downside, bubble sort requires more passes than more advanced algorithms—which make it very slow if sorting large lists. Additionally, while bubble sort may be simple to understand and code, other algorithms like Quick Sort are more efficient as they take fewer passes over the list.

Implementing Bubble Sort Algorithm in Javascript

The bubble sort algorithm can be implemented in Javascript using the following code:

``function bubbleSort(arr) {   for (let i = 0; i < arr.length; i++) {     for (let j = 0; j < arr.length - i - 1; j++) {       if (arr[j] > arr[j + 1]) {         let temp = arr[j];         arr[j] = arr[j + 1];         arr[j + 1] = temp;       }     }   }   return arr; }``

This code will create an array which can then be sorted in ascending or descending order using bubble sort.

Step-by-Step Guide to Writing a Bubble Sort Algorithm in Javascript

Writing a Bubble Sort Algorithm in Javascript can be completed with the following steps:

1. Create a function that takes an array as an argument.
2. Create two “for” loops. The first “for” loop should run through each element of the array once. The second “for” loop should check each element of the array based on the “for” loop’s current index.
3. In both “for” loops, create an “if” statement that checks if the current index value is larger than the next index value.
4. If the “if” statement evaluates to true, create a temporary variable which holds the first index value in an attempt to swap it with the next index value.
5. Then, use this temporary variable to manually swap the two index values.
6. Return the array after it has been looped through.

By following these steps, you can successfully implement a Bubble Sort Algorithm in Javascript.

Common Pitfalls of Writing a Bubble Sort Algorithm in Javascript

When implementing a bubble sort algorithm, there are several common pitfalls that should be avoided. Firstly, be aware that certain implementations of this algorithm will require two passes over the same data set, while others only require one pass. Secondly, be mindful that some implementations of this algorithm will include loops within loops. These can slow down the process significantly and should be avoided wherever possible. Thirdly, take care of unsorted data sets. Some implementations will fail when dealing with unsorted data sets and will require additional code to resolve these issues.

Performance Considerations for Using the Bubble Sort Algorithm

When using a bubble sort algorithm for sorting data, always bear in mind that this type of algorithm tends to be slow compared to more advanced options such as quick or radix sort algorithms. Additionally, as mentioned previously – bubble sorts require multiple passes over the same data set – so any large amount of data could significantly affect performance and resource usage.

Examples of Bubble Sort Algorithms in Javascript

One example of implementing a Bubble Sort Algorithm in Javascript would be as follows:

``function bubbleSort(items) {      for (let i=0; i items[j]) {            //If item i is greater than item before/after item j (depending on pass)                  let temp = items[i];              //Store item i in a temporary variable called temp                 items[i] = items[j];              //Swap item j with item i by setting item i equal to item j                 items[j] = temp;                  //Set item j equal to temp (the original value of item i)             }         }      }      return items;                                //Return sorted items   }``

This example takes an array as a parameter and returns it sorted using bubble sort.

In conclusion, understanding how to use and implement a bubble sort algorithm in Javascript can help you to sort your data quickly and accurately. However, bear in mind that this type of sorting algorithm may be slower than other alternatives, and will require multiple passes over your data set before it is sorted correctly.

Anand Das

Anand is Co-founder and CTO of Bito. He leads technical strategy and engineering, and is our biggest user! Formerly, Anand was CTO of Eyeota, a data company acquired by Dun & Bradstreet. He is co-founder of PubMatic, where he led the building of an ad exchange system that handles over 1 Trillion bids per day.

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