# Javascript Bubble Sort

| | | |

## How to write a JavaScript bubble spell

Do you have a list of values ‚Äã‚Äãthat you need to sort? Sorting bubbles could be for you. Bubble sorts compare adjacent items in a list and swap their positions if they are not in the correct order.

In this guide we are going to talk about what kind of bubble are and how they work. We will see how to write a Bubble Sort in JavaScript so that you can quickly get started with this genre.

Let s start!

## What is a JavaScript Bubble Sort?

A sort of bubble, or "sort damping," is a simple sorting algorithm, which compares a pair of adjacent items in a list. If an element is not in order, we swap the element with the previous one. Otherwise, the item stays at the same location.

Tri Bubble got its name because it scrolls through a list and moves all the most important values ‚Äã‚Äãto the end. Another way to think about this is that the greatest values ‚Äã‚Äã"bubble up" at the end of the list. Bubble kinds work in both ascending and descending order

There are two kinds of bubble kinds: .. Regular and optimized

Regular bubble kinds make all possible comparisons, it doesn’t matter if an array is sorted. Kinds of Optimized bubbles stop running at the end of an iteration if no swap has taken place.

## Bubble Sort JavaScript Procedure

We’ll start by talking about how the bubble sorts work, and then implement one in JavaScript. Consider the following list of elements:

 9 3 2 11

To start our genre , we will compare the first and second numbers. If the first number is greater than the second number, we swap the elements. Otherwise, the elements remain in the same position

9 is greater than 3 so that the positions of the first two elements swap:

 3 9 12 2

This process continues until all the items in the list are compared.

9 does not exceed 12, so these items remain in the same place. 12 is greater than 2, so these elements swap:

 3 9 2 12

Our the list starts to look cleaner. Our algorithm repeated the list once. It will continue to do so until we let’s order each item. In the next iteration, our program makes the following comparisons:

• is 3 greater than 9? No, nothing is happening.
• 9 is greater than 2? Yes, so the items swap.
• 9 is greater than 12? No, nothing happens.

After this iteration, our list looks like this:.

 3 2 9 12
We’re almost there. In the next iteration, we swap the first two items, which gives us a complete ordered list:

We did it! We have categorized a list using bubble sort. Now comes the tricky part:. The development work of this algorithm in JavaScript

## How to write an algorithm bubble sorting in JavaScript

We can write an algorithm sorting JavaScript bubble. We are going to create two types of bubbles: a normal sort and an optimization of a

### regular bubble sort

Let’s start by defining a JavaScript function that performs our bubble sort:

This function accepts an array of numbers and sorts using the bubble sort algorithm . To begin with, the algorithm creates a loop that passes through each element of the list

Our code uses the length attribute of the array to calculate the length of the list. , We then declare another loop. This loop makes comparisons between each item in the list.

For each iteration of our inner loop, our program executes an if statement. This JavaScript if statement checks whether the number on the left of a comparison is greater than the number on the right. In this case, our program swaps the numbers. Otherwise, nothing happens.

returns the array to the main program after sorting them. Let’s call our function and give it an example array:

We have declared JavaSc variables ript called numbersToSort which contains the digits we want to the order. We then called our sortItems () method and adopted that variable as a parameter. This sorts our list. We print the new ordered list in the JavaScript console of the browser :. [2, 3, 9, 11]

ORDERS of ours list code in ascending order. We can change this behavior by replacing the "greater than" value to access our "if" declaration with a "minus" sign:

We’re almost done! Let’s make our code more efficient by implementing the sorting bubble with a variable interchanged.

### optimized bubble Sort

optimized bubble introduced Sort a new variable. This variable keeps track of whether the exchange was held. Tri stop if no swap occurred

To make our genre bubble more efficient, we’ll replace our outer for the loop with a while loop:

The while loop will be executed until "swapped" is false. By default, the value of "purse" is true. In each iteration of our list, we’ve set the value of "swapped" to false. If a swap occurs, the value of "swapped" returns true

this allows us to keep track of whether an exchange has been done in an iteration. If no exchange has been made, it means that our list is sorted. in this case, we can stop our bubble sort.

Let try using this bubble’s sort:

Our code returns:. [2, 3, 9, 11] list is sorted. this algorithm is more efficient because it does not perform unnecessary comparisons. as soon as the list is sorted, the algorithm stops working.

## Conclusion

Kinds of bubbles are an easy way to sort a Compare the list of adjacent items in a list or swap them and if they are not in the correct order.

More efficient kinds are available such as insert sort or merge sort. These types are more advanced. Kinds of bubbles are usually the best way to start learning about sorting algorithms .

## Javascript Bubble Sort insert: Questions

How to insert newlines on argparse help text?

I"m using `argparse` in Python 2.7 for parsing input options. One of my options is a multiple choice. I want to make a list in its help text, e.g.

``````from argparse import ArgumentParser

parser = ArgumentParser(description="test")

parser.add_argument("-g", choices=["a", "b", "g", "d", "e"], default="a",
help="Some option, where
"
" a = alpha
"
" b = beta
"
" g = gamma
"
" d = delta
"
" e = epsilon")

parser.parse_args()
``````

However, `argparse` strips all newlines and consecutive spaces. The result looks like

```~/Downloads:52\$ python2.7 x.py -h
usage: x.py [-h] [-g {a,b,g,d,e}]

test

optional arguments:
-h, --help      show this help message and exit
-g {a,b,g,d,e}  Some option, where a = alpha b = beta g = gamma d = delta e
= epsilon
```

How to insert newlines in the help text?

406

Try using `RawTextHelpFormatter`:

``````from argparse import RawTextHelpFormatter
parser = ArgumentParser(description="test", formatter_class=RawTextHelpFormatter)
``````

Is a Python list guaranteed to have its elements stay in the order they are inserted in?

If I have the following Python code

``````>>> x = []
>>> x = x + [1]
>>> x = x + [2]
>>> x = x + [3]
>>> x
[1, 2, 3]
``````

Will `x` be guaranteed to always be `[1,2,3]`, or are other orderings of the interim elements possible?

366

Yes, the order of elements in a python list is persistent.

Inserting image into IPython notebook markdown

I am starting to depend heavily on the IPython notebook app to develop and document algorithms. It is awesome; but there is something that seems like it should be possible, but I can"t figure out how to do it:

I would like to insert a local image into my (local) IPython notebook markdown to aid in documenting an algorithm. I know enough to add something like `<img src="image.png">` to the markdown, but that is about as far as my knowledge goes. I assume I could put the image in the directory represented by 127.0.0.1:8888 (or some subdirectory) to be able to access it, but I can"t figure out where that directory is. (I"m working on a mac.) So, is it possible to do what I"m trying to do without too much trouble?

277

Most of the answers given so far go in the wrong direction, suggesting to load additional libraries and use the code instead of markup. In Ipython/Jupyter Notebooks it is very simple. Make sure the cell is indeed in markup and to display a image use:

``````![alt text](imagename.png "Title")
``````

Further advantage compared to the other methods proposed is that you can display all common file formats including jpg, png, and gif (animations).

## Javascript Bubble Sort JavaScript: Questions

JSON datetime between Python and JavaScript

By kevin

I want to send a datetime.datetime object in serialized form from Python using JSON and de-serialize in JavaScript using JSON. What is the best way to do this?

403

You can add the "default" parameter to json.dumps to handle this:

``````date_handler = lambda obj: (
obj.isoformat()
if isinstance(obj, (datetime.datetime, datetime.date))
else None
)
json.dumps(datetime.datetime.now(), default=date_handler)
""2010-04-20T20:08:21.634121""
``````

Which is ISO 8601 format.

A more comprehensive default handler function:

``````def handler(obj):
if hasattr(obj, "isoformat"):
return obj.isoformat()
elif isinstance(obj, ...):
return ...
else:
raise TypeError, "Object of type %s with value of %s is not JSON serializable" % (type(obj), repr(obj))
``````

Update: Added output of type as well as value.
Update: Also handle date

What blocks Ruby, Python to get Javascript V8 speed?

Are there any Ruby / Python features that are blocking implementation of optimizations (e.g. inline caching) V8 engine has?

Python is co-developed by Google guys so it shouldn"t be blocked by software patents.

Or this is rather matter of resources put into the V8 project by Google.

260

What blocks Ruby, Python to get Javascript V8 speed?

Nothing.

Well, okay: money. (And time, people, resources, but if you have money, you can buy those.)

V8 has a team of brilliant, highly-specialized, highly-experienced (and thus highly-paid) engineers working on it, that have decades of experience (I"m talking individually – collectively it"s more like centuries) in creating high-performance execution engines for dynamic OO languages. They are basically the same people who also created the Sun HotSpot JVM (among many others).

Lars Bak, the lead developer, has been literally working on VMs for 25 years (and all of those VMs have lead up to V8), which is basically his entire (professional) life. Some of the people writing Ruby VMs aren"t even 25 years old.

Are there any Ruby / Python features that are blocking implementation of optimizations (e.g. inline caching) V8 engine has?

Given that at least IronRuby, JRuby, MagLev, MacRuby and Rubinius have either monomorphic (IronRuby) or polymorphic inline caching, the answer is obviously no.

Modern Ruby implementations already do a great deal of optimizations. For example, for certain operations, Rubinius"s `Hash` class is faster than YARV"s. Now, this doesn"t sound terribly exciting until you realize that Rubinius"s `Hash` class is implemented in 100% pure Ruby, while YARV"s is implemented in 100% hand-optimized C.

So, at least in some cases, Rubinius can generate better code than GCC!

Or this is rather matter of resources put into the V8 project by Google.

Yes. Not just Google. The lineage of V8"s source code is 25 years old now. The people who are working on V8 also created the Self VM (to this day one of the fastest dynamic OO language execution engines ever created), the Animorphic Smalltalk VM (to this day one of the fastest Smalltalk execution engines ever created), the HotSpot JVM (the fastest JVM ever created, probably the fastest VM period) and OOVM (one of the most efficient Smalltalk VMs ever created).

In fact, Lars Bak, the lead developer of V8, worked on every single one of those, plus a few others.

Django Template Variables and Javascript

When I render a page using the Django template renderer, I can pass in a dictionary variable containing various values to manipulate them in the page using `{{ myVar }}`.

Is there a way to access the same variable in Javascript (perhaps using the DOM, I don"t know how Django makes the variables accessible)? I want to be able to lookup details using an AJAX lookup based on the values contained in the variables passed in.

256

The `{{variable}}` is substituted directly into the HTML. Do a view source; it isn"t a "variable" or anything like it. It"s just rendered text.

Having said that, you can put this kind of substitution into your JavaScript.

``````<script type="text/javascript">
var a = "{{someDjangoVariable}}";
</script>
``````

This gives you "dynamic" javascript.

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