front | Core component of new generation analytics platform

I'm normally OK on the joining and appending front, but this one has got me stumped.

I've got one dataframe with only one row in it. I have another with multiple rows. I want to append the value from one of the columns of my first dataframe to every row of my second.

df1:

df2:

Output I'm seeking:

df2

I figured that this was along the right lines, but it listed out NaN for all rows:

Warning: I'm not good at JavaScript, I based the JavaScript part off of this post.

So I have a little Script that should set theDuration to an HTML element in the front window of active tab. I looked at the HTML and the Element in full is 00:10:00. I want theDuration to be 00:10:00. I know you can set JavaScript variables to the JavaScript code below since it's mentioned in the post I based it off of, but when I try to run the code down below, it doesn't work.

I have timecodes with this structure hh:mm:ss.SSS for which i have a own Class, implementing the Temporal Interface. It has the custom Field TimecodeHour Field allowing values greater than 23 for hour. I want to parse with DateTimeFormatter. The hour value is optional (can be omitted, and hours can be greater than 24); as RegEx (\d*\d\d:)?\d\d:\d\d.\d\d\d

For the purpose of this Question my custom Field can be replaced with the normal HOUR_OF_DAY Field.

My current Formatter

I'm making a POC with Lumen and Vue.JS. For now it just has to send a "hello world" message from the Lumen back-end to the Vue.JS front-end (which works). I have made an event which is triggered upon loading the page like this:

I have a two sets of data in database one is date and one is time. I display my data in calendar. I made one post request when user choose the date, that time will be selected for the user. I want to make one helper function when user's choosing time will be over I want to show them alert in front-end that "Your selected time expired!". I am using date-fns for date validation.

This is my code so far:

I have a route in the backend that I would like to call every X amount of time. Right now I am using ajax to make the call from a set interval function on the client side:

I'd like to implement UPDATE (method PUT) operation for REST api. From front-end application my controller method expects map of values, for example:

I am trying to build a cinema app with flutter. The structure is as follows:

• in each city there are a bunch of cinemas
• in a cinema there are a bunch of showrooms(salle in french)
• in a showroom(salle in french) there are five display sessions or projections, these projections are of the same film.

because the projections are of the same movie (a showroom displays the same movie in different time(e.g projections) by design), when I click on any of the projections in a showroom I should have the same posture of the same film, not a different posture in each projection.

However I get a different film posture in each projection, and I don't know what is causing this.

I am using a rest api that I created with Spring, and I am certain that the problem is not from my back-end because I am using it in an angular web app and it's working perfectly.

This is a layout of my application

this is what happened when I click on two projection of the same showroom( notice that the posture changes when it shouldn't.

and here is the code of the showroom page (salles-page.dart)

I was trying to create a thread safe queue, but something went wrong. I can't understand why does my thread freeze. Expected: 1 2 3, but i get nothing (everything just freezes)

I guess the problem is misuse of condition variable in front (pop) and get (peek) methods, but I can't find my mistake. Could you please point out my mistake and explain what the mistake is?