# Javascript To Correct

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There is a method of the Number object in JavaScript that allows us to set a fixed decimal point on a number and then return it as a string. This article will talk about the syntax of this method and show you how to use it.

When we talk about primitives in JavaScript, we are talking about elements that are not objects and to which no method is associated. When we want to take a primitive value and make it an object, we can do it with primitive envelopes which can bypass the value or the data type.

Numbers have a primitive wrapper object. We use it to transform the string representations of a number into an actual Number object with methods we can apply on it.

For example, let’s say we have a string representation of a number because we have a form that requires the user to enter a numeric value for a field on the screen . We can take this input, turn it into a number, and then use any number of methods to work with that value.

Here we have used the toFixed () method of the Number object to make the number the desired length. The syntax of the method is as follows:

If you are dealing with forms, there is one thing you should remember: these values ‚Äã‚Äãcome in the form of strings. So, to use the `toFixed ()` method on them, you need to turn them into numeric representations.

We do it here by wrapping the entries with the Number wrapper (n ). The first variable, x, is the floating point number you want to shorten (or lengthen as appropriate). The second variable, y, is the number of places where you want the number to exceed the decimal point.

Try a few of these numbers to see what you get in the code editor:

As you can see the number of digits adjusts according to the y variable entered in the Num Places entry. If the number is not long enough to compensate for the Num Places value, it will fill the string with zeros until it reaches the desired length.

If the number is long and the Num The places entry is shorter than the available digits after the decimal point, the number will be shortened and rounded off to return the representation as a string desired number.

Note : If you want to use it as a number in your logic after it has been manipulated and returned, you will have need to transform it back to a number using the primitive digital wrapper like we did above.

### What should you learn next ?

JavaScript Random Number: a complete guide

JavaScript ParseInt: a step-by-step guide

JavaScript countdown: a tutorial

JavaScript toString

## Javascript To Correct iat: Questions

InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately

Tried to perform REST GET through python requests with the following code and I got error.

Code snip:

``````import requests
url = az_base_url + az_subscription_id + "/resourcegroups/Default-Networking/resources?" + az_api_version
``````

Error:

``````/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py:79:
InsecurePlatformWarning: A true SSLContext object is not available.
This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail.
InsecurePlatformWarning
``````

My python version is 2.7.3. I tried to install urllib3 and requests[security] as some other thread suggests, I still got the same error.

Wonder if anyone can provide some tips?

334

The docs give a fair indicator of what"s required., however `requests` allow us to skip a few steps:

You only need to install the `security` package extras (thanks @admdrew for pointing it out)

``````\$ pip install requests[security]
``````

or, install them directly:

``````\$ pip install pyopenssl ndg-httpsclient pyasn1
``````

Requests will then automatically inject `pyopenssl` into `urllib3`

If you"re on ubuntu, you may run into trouble installing `pyopenssl`, you"ll need these dependencies:

``````\$ apt-get install libffi-dev libssl-dev
``````

## Javascript To Correct iat: Questions

Dynamic instantiation from string name of a class in dynamically imported module?

In python, I have to instantiate certain class, knowing its name in a string, but this class "lives" in a dynamically imported module. An example follows:

``````import sys
def __init__(self, module_name, class_name): # both args are strings
try:
__import__(module_name)
modul = sys.modules[module_name]
instance = modul.class_name() # obviously this doesn"t works, here is my main problem!
except ImportError:
# manage import error
``````

``````class myName:
# etc...
``````

I use this arrangement to make any dynamically-loaded-module to be used by the loader-class following certain predefined behaviours in the dyn-loaded-modules...

222

You can use getattr

``````getattr(module, class_name)
``````

to access the class. More complete code:

``````module = __import__(module_name)
class_ = getattr(module, class_name)
instance = class_()
``````

As mentioned below, we may use importlib

``````import importlib
module = importlib.import_module(module_name)
class_ = getattr(module, class_name)
instance = class_()
``````

## Javascript To Correct iat: Questions

How to get all of the immediate subdirectories in Python

I"m trying to write a simple Python script that will copy a index.tpl to index.html in all of the subdirectories (with a few exceptions).

I"m getting bogged down by trying to get the list of subdirectories.

184

``````import os
def get_immediate_subdirectories(a_dir):
return [name for name in os.listdir(a_dir)
if os.path.isdir(os.path.join(a_dir, name))]
``````

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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