DEV Community: Pike Msonda

JS float rounding bug

Pike Msonda — Fri, 17 Dec 2021 11:32:34 +0000

I have been familiarizing myself with Stripe API. So far so good but today I run into this interesting bug. Stripe gives currency amounts using cents (if you are in the US). Obviously when displaying to the end user you need to convert to proper readable USDs.

And when you want to updated or make purchases you have to reconvert to cents for the API to accept the request.

3380 * 0.01 // converts to $33.8  nothing special here.

When completing a payment or charge in my setup. I convert $33.8 dollars back to cents. However when I do so, the resulting amount was not exactly 3338.

33.8 * 100 = 3379.9999999999995

Because of this Stripe retuned an error.

My first solution was to use parseInt but that returned 3379. This is unsatisfactory since 1 cent has been lost.

A more satisfactory solution was to do the following:

33.8.toString().split('.').reduce((a, b) => a * 100 + b * 10) // 3380

Another solution would be to round off the float using toFixed like below:

parseInt(33.8 * 100).toFixed()) // 3380

Simple python string replace without using in-built function

Pike Msonda — Fri, 27 Nov 2020 18:14:14 +0000

A friend asked if I could replicate the python in-built string replace function.

Not as robust of course but I thought I should give it a try.

Below is my take.

Any ideas to improve this are welcome.

def replace(strng, substr, rplstr): 
    if substr not in strng:
        return strng

    low_index = strng.find(substr) # get lowest index of substring
    high_index = low_index + len(substr) # evaluate the highest index of substring

    return replace(strng[:low_index]+ rplstr + strng[high_index:], substr, rplstr)

Output

print(replace("Hello World Hello World", "llo", "@@"))
He@@ World He@@ World

Extract 20BN-Jester dataset on Windows

Pike Msonda — Mon, 09 Nov 2020 09:58:38 +0000

Introduction

For those that do not know 20BN-Jester dataset. It is human interaction dataset, it contains humans perfoming a list of pre-defined gestures. Recently has been used for as a benchmark set for different types of Convolutional Neural Networks (CNNs).

Download
You can download the dataset from the official website. Fortunately it is free for academic research.
Extract
It is fairly easy to extract on unix based operating systems. However, it is not the same when it comes to windows based systems.

After you download you are given a command to use to extract as given below:

cat 20bn-jester-v1-?? tar xf -

Usually this extracts to a point. For some reason it doesn't completely extract the entire dataset. For this, you can exectute this command.

cat 20bn-jester-v1-??|gzip -dc|tar xf -

This solution was posted on Stackoverflow, check it out.

Note:

Use a unix based shell like git bash to be able to run gzip as it is not available by default on Windows.

How to retrieve tokenID from acess_token (Personal Access Token)

Pike Msonda — Wed, 15 Jan 2020 15:25:19 +0000

The gist

I am assuming you are already aware of how Laravel/Passport works.

Let's say you have generated a lot of personal access tokens that are associated to a specific user and you would like to delete a specific token without having to delete all the other tokens.

I am sure you are thinking, I will just get the token associated with the user using the relationship already defined if you use the HasAPiKeys from Laravel/Passport.

That is well and good if the user is also serving as a client in your api. But if it is just a Personal Access Token you can't retrieve the access token of created for that user (unless you get it from the header, but that won't really help solve your problem since you still have to know which token matches a particular ID) because of how Laravel/Passport is designed.

To bypass this scenario you can use the following code below.

Forgive me for using an image instead of embedded code 😅. Let me know below if this helps.

Thanks to

.ltag__user__id__318088 .follow-action-button { background-color: #2e0338 !important; color: #ffffff !important; border-color: #2e0338 !important; }

mstfakdgn

Php, Laravel, Docker, Docker-compose, Angular, Ionic mobile, Android, Vue.js,

I was able to figure it out.