How can I guarantee that my enums definition doesn't change in JavaScript?

Would the following make the objects fulfill all charasteristics that enums have in JavaScript? Something like: my.namespace.ColorEnum = { RED : 0, GREEN : 1, BLUE : 2 } // later...

How abstraction and encapsulation differ?

I am preparing for an interview and decided to brush up my OOP concepts. There are hundreds of articles available, but it seems each describes them differently. Some says Abstraction is "the...

What does `ValueError: cannot reindex from a duplicate axis` mean?

I am getting a ValueError: cannot reindex from a duplicate axis when I am trying to set an index to a certain value. I tried to reproduce this with a simple example, but I could not do it. Here is...

What are probabilistic data structures?

I have read about data structures like bloom filters and skip lists. What are the common characteristics of probabilistic data structures and what are they used for?

Chrome : Bluetooth L2CAP protocal is not supported

I want to connect my bluetooth remote control using chrome application, but i get folowwing error "Bluetooth L2CAP protocal is not supported" I want to connect my bluetooth remote or mobile with...

Existence of mutable named tuple in Python?

Can anyone amend namedtuple or provide an alternative class so that it works for mutable objects? Primarily for readability, I would like something similar to namedtuple that does this: from...

How to create multiple connection at same time in Android bluetooth low energy (BLE)?

I am working on an Android BLE application. Is there any procedure for connecting multiple BLE devices (creating multiple connections)at same time in Android. As In my app there are multiple...

Teradata SQL Optimization

I hope this is concise. I am basically looking for a methodology on how to improve queries after watching one of my colleagues speed up my query almost 10 fold with a quick change I had a query...

Is there a definite Selenium solution to modal pop up dialogs in Internet Explorer with Java?

I have searched many, many places for a solution to my problem, but haven't found it. I figured that by now, Selenium would have provided a straight forward and simple solution to handling modal...

Golang: how to make http client not following redirects?

I would like to make an http call using an http client with these characteristics: don't follow redirects (just get the full response of the first call, which returns a 302 redirect code) being...

AttributeError: 'Model' object has no attribute 'predict_classes'

I'm trying to predict on the validation data with pre-trained and fine-tuned DL models. The code follows the example available in the Keras blog on "building image classification models using very...

How can I create single-thread coroutine context under Common pool in Kotlin?

Short requirement: have ability to create corotine context, which will executed in the single thread only (e.g. without parallelism). Additional requirement: it is better to use existing...

iOS: Writing is not permitted for write descriptor

I am building simple app for Central and Peripheral sample, Central code works fine as I am able to write both characteristics and descriptor when Android acts as Peripheral, But when iOS acts as...

Does every stateful intermediate Stream API operation guarantee a new source collection?

Is the following statement true? The sorted() operation is a “stateful intermediate operation”, which means that subsequent operations no longer operate on the backing collection, but on an...

How can I write multiple values to a BLE characteristic via Javascript?

I'm currently working on a project that involves me trying to send a ZPL-Label from a Browser to a Zebra Printer (ZQ520) using Javascript and Bluetooth. Currently I'm able to find the printer via...

What's the most space-efficient way to compress serialized Python data?

From the Python documentation: By default, the pickle data format uses a relatively compact binary representation. If you need optimal size characteristics, you can efficiently compress pickled...

In DDD/CQRS, should ReadModel act as ViewModel, if not then where belongs responsibility for mapping?

Assume read model ProductCatalogueItem is built from aggregates/write-models, stored separately from write-models, and contains each product available for selling, and has following...

Is there a function that returns the number of characters in BigNumber.js?

I know about decimalPlaces: const number = new BigNumber(100.5254); number.decimalPlaces(); // 4 And precision: const number = new BigNumber(100.5254); number.precision(); // 7 But I couldn't...

How to append Bool value of a struct in Swift

So, I'm coding in Swift and I've made a struct called User. It has four categories of characteristics- name, email, number of followers, and activity status. I am able to append values of the...

How do I get the value of Heart Rate Measurement from a Polar H10 in iOS using Swift and Core Bluetooth?

I am using Polar H10 as a heart rate monitor and I would like to get the values that are in the Heart Rate Measurement Characteristic in iOS using Swift and Core Bluetooth. Here is the code in the...

Replace BLE callbacks using Kotlin Coroutines

I want to use Kotlin's coroutines to handle BLE's asynchronous callbacks. Connecting to a BLE device takes a callback object, something like: connectToBle(Context, Boolean, GattCallback) The...

Read/Write characteristic using custom service BLE in Android

I am trying to connect the Thermometer with an android device using BLE. I am getting proper results using Gatt characteristics specifications and services. but there is one custom service I am...

How to create a graph with an image's pixel?

Now, I have an image.I want to generate a weighted graph G=(V,E) which V is the vertex set and E is the edge set (each pixel in the image as a node in the graph). But I don't know how to do it. Is...

Flutter loop carousel cards

I have a problem with flutter. I wanted to create a carousel that's in loop, so when you are at the final element, the first one is the next. But without using a 3rd party widget. Is there any way...

how to recieve data using flutter_blue in flutter

I'm actually confused how I can receive data using flutter_blue package, I can send data but I can not receive and this is the example I've been using: startScan() { setState(() { ...

How can I use switchMap instead of nested subscriptions?

I'm still learning observables, so I won't be surprised if there's an easy solution. Basically what I have right now is four nested subscriptions with a fourEach inside the second subscribe(). I...

How to set a css property (background-color) dynamically in React?

I have a slideshow based on an array of objects with its characteristics, one of them is the background-color of the current slide. I have a property called bg which stores it. This is what I am...

Why its so hard to get GATT specifications for hearing devices?

I'm trying to find bluetooth GATT specifications for glucose meters and hearing devices. But the only thing I've found is https://www.bluetooth.com/specifications/gatt/removed/ or some older...

Prevent ffmpeg from changing the intensity of colors while downscaling the resolution of the video

I have a use case where I need to downscale a 716x1280 mp4 video to 358x640 (half of the original). Command that I used is ffmpeg -i ./input.mp4 -vf...

bleManager.startDeviceScan not working on iOS react-native-ble-plx

I am trying to pair a gateway to React native app using the react-native-ble-plx. The below source code works fine in Android wheras in iOS, the bleManager.startDeviceScan() is not triggered....