How to use array optimization in boost serialization

I have to serialize an object that contains a std::vector that can contain thousand of members, with that vector sizes the serialization doesn't scale well. According with the documentation, Boost...

Whats the right approach to return error codes in C++

I'm using error codes for handling errors in my c++ project. The problem is how to return error codes from a function which is supposed to return some variable/object. consider this: long val =...

How to block calls to print?

Is there a way to stop a function from calling print? I am using the pygame.joystick module for a game I am working on. I created a pygame.joystick.Joystick object and in the actual loop of the...

How do I implement an array of strings?

I tried to implement a word that produces a string from an array when given a number on the stack in Forth. My first naive attempt was: create myarray s" Alpha" , s" Beta" , s" Charlie" , This...

String that is initialized lazily in Python

I figured out that with deriving from str and overwriting __new__ you can overwrite strings. Do you know any magic that would create a lazily initialized string? Therefore def f(a, b): ...

imap_fetchstructure() doesn't return the parts object

I have a problem in imap_fetchstructure($this->stream,$messageNumber). some email used is working perfectly and another email is not working, the problem is: the parts object is missing in the...

Delete html Row and Delete Column button using Javascript

I am trying to achieve like the pic below: I don't seem to get the "delete selected column" right and also Delete selected row; instead the are deleting all rows and all columns. So far I have...

Dynamically set property of nested object

I have an object that could be any number of levels deep and could have any existing properties. For example: var obj = { db: { mongodb: { host: 'localhost' } ...

Fastest way to flatten / un-flatten nested JSON objects

I threw some code together to flatten and un-flatten complex/nested JSON objects. It works, but it's a bit slow (triggers the 'long script' warning). For the flattened names I want "." as the...

VB.Net SQL results to JSON for Ajax

New programmer, I'm building an aspx page with VB.Net code and I'm trying to create a D3 chart with data from our database, but I can't get the return value into the correct format. In my VB code...

Python pandas apply function if a column value is not NULL

I have a dataframe (in Python 2.7, pandas 0.15.0): df= A B C 0 NaN 11 NaN 1 two NaN ['foo', 'bar'] 2 three 33 NaN I want to apply a...

Calculate days between two Dates in Java 8

I know there are lots of questions on SO about how to get Dates in Java, but I want an example using new Java 8 Date API. I also know about the JodaTime library, but I want a method without...

How to use a dynamically generated object as the data source of CodeEffects generator

We are using this component www.codeeffects.com which allows us to create business rules based on the object properties. The html of the view is like this: @{ ViewBag.Title = "Post Example"; ...

How to get values from child components in React

So I am just starting to use React and am having trouble gathering the input values of inputs within a child component. Basically, I am creating different components for a large form I am making,...

Background image keeps disappearing

I'm using Free Code Camp to learn, and a few days ago got to the Portfolio Project. I've made some great progress and have learned quite a bit, but I'm stuck on one pretty important bit. My...

Merge two objects with ES6

I'm sure this question has been asked before but I can't quite find the answer I'm looking for, so here goes: I have two objects, as follows: const response = { lat: -51.3303, lng:...

silent sign in using oidc client with identity server 4

I'm trying to implement silent login in oidc-client to use with Angular 2 How can use oidc client to silently check if user is already logged in (idsvr4) and display the login details. the...

AWS ApiGateway Lambda Proxy access Authorizer

I´m using an Lambda Proxy and a Cognito User Pool Authorizer in my ApiGateway. In the Lambda function I can access the path etc. variables via the event object. In addition to that I want to...

Go to definition and back to reference in visual Studio Code

I'm currently using VSCode and am trying to use the F12 shortcut which takes me to a definition of an object/function. When I want to go back to the reference, I can't seem to find the right way...

Spark dataframe to arrow

I have been using Apache Arrow with Spark for a while in Python and have been easily able to convert between dataframes and Arrow objects by using Pandas as an intermediary. Recently, however,...

Object.entries with forEach to map array of objects returns undefined except when console.log is used

I have an array of objects that have key value pairs, I want to find a specific key in each object and return the value. A sample of the Array: filterCounties=[ { "StateName": "Delaware", ...

python 'module' object is not callable when calling a function

I know there are several thread regarding this error, but I cant seems to find the right solution for this. from libcomcat.search import search import datetime eventlist = search(starttime =...

How to add srcObject attribute of video tag and dynamically insert that to html page using java script,jQuery

media stream object inside console and this is what i'm getting after setting source attributeThis is the function at clientside script,I'm using webrtc to do a project and below function is...

Import UMD Javascript Modules into Browser

Hi I am doing some research on RxJS. I am able to use the library simply by referencing it in my browser as such: <script...

Having Ref object as class member

I wish to pass by reference my data to a class where the reference itself should be the public variable, to be accessed by member functions. If I declare my class and its constructor class...

What happens to a complete observable? What if I subscribe to a completed observable?

I'm having trouble finding what happens to an Observable when it has completed. I have an observable that must complete before I do other work. To do this, my other functions subscribe that...

TS2538 Type 'undefined' cannot be used as an index type. when check assigned to variable

I get TS error: TypeScript error: Type 'undefined' cannot be used as an index type. TS2538 For this simple function (getting object from array based on provided index): const myArr:...

How to plot marginal effect of an interaction after felm() function

I ran a regression based on a "giant" panel data with a bunch of unit fixed effects. So I employed function "felm()" from package "lfe". In addition, I have an interaction term of two continuous...

How to fetch n dependent data with react-query

I need help with react-query library. I fetch a list of objects and then for everyone I need to fetch additional data from another service. How should I do this with react-query useQuery...

How solve Codility equiLeader challenge

After finding the "leader" I tried finding the possible equiLeaders in the given array but couldn't. Tried to find a solution of someone else but can't wrap my head around what he did. I left a...