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    JS/React Execution Order paradox Ask Programming

    September 01, 2021

    JS/React Execution Order paradox Ask Programming

    JS/React Execution Order paradox

    Posted: 01 Sep 2021 05:38 PM PDT

    I'm trying to use Sagecell (source) together with ReactJS to "totally" not make a worse jupyter notebook, particularly a function sagecell.makeSagecell(). From my research it seems that the function is usually called only once in the <head> of a HTMLfile to replace a div in the code with some sort of generated widget.

    The problem: I wish to call this function with input parameters within my .js code, yet I am unsure how to call this function directly from the URL (provided above) . I have thus temporarily resorted to placing this function in my HTML code and use a script src and script to call this function.

    Purpose: I want to be able to add Sagecell objects to my page on button click

    index.html

    <!DOCTYPE html> <html lang="en"> <head> .... <script> // Make *any* div with class 'compute' a Sage cell function refreshSage() { sagecell.makeSagecell({inputLocation: 'div.compute', evalButtonText: 'Evaluate', linked: true}); console.log("refresh"); } refreshSage(); </script> .... </head> </html>

    Sagecells.js

    import React from "react"; export default class SageCells extends React.Component{ constructor() { super(); this.state = { numCells: 5 } } addCell = () => { this.setState({numCells: this.state.numCells + 1}); console.log("adding cell"); } getCells() { console.log("drawing cells"); var cellArray = []; for (var i = 0; i < this.state.numCells; i++) { cellArray.push( <div className="compute" key={Math.random()}> <script type="text/x-sage"> </script> </div> ); } return cellArray; } render() { return ( <div> <h1>{this.state.numCells}</h1> {this.getCells()} <button id="addCell" onClick={this.addCell}>Add new cell</button> </div> ); } };

    From my testing, it seems that the JS is executed first, populating the default 5 divs i create via getCells() , calling sagecell.makeSagecell() from the HTML works nicely because there are div targets to transform. On button click however, I had the intention to re-apply sagecell.makeSagecell() because of how it transforms divs, but the flow ended up being refresh > add > draw.

    Ideally I want to achieve add > draw > refresh so that I can get my new cell every time

    P.S. I know about my cellArray being a temporary variable, I'm also unsure with how to improve this. Am completely new to JS/React/Node etc

    submitted by /u/HalcionCyanide
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    What does Math.Pow(x,2) do under the hood, that is much slower than x*x?

    Posted: 01 Sep 2021 10:30 AM PDT

    Hello, I am asking about C#

    submitted by /u/GummiBot
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    Is there a cheat sheet for coding, or is learning the language from the ground up the only way?

    Posted: 01 Sep 2021 12:16 PM PDT

    Like is there like a cheat sheet, or a "tracing" of learning a language?

    I'm not sure if there is like a place on GitHub or something I could use to get an idea for how the language works.

    submitted by /u/nismofan2019fan3
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    Please point me in the right direction for what kind of app/program would work for what I'm trying to do

    Posted: 01 Sep 2021 04:23 PM PDT

    Hello! I hope I an explain what I'm trying to do the best here..

    I am a huge fan of the show Twin Peaks. As such, I've been trying to "solve" the show for the longest time. Usually when I rewatch the show, I noticed things (clues) I did not the time before. What I'm hoping to do is create an app/program where I can jot down certain notes, with the ultimate goal of tying notes/keywords/etc together to get a full picture.

    For example I might make a note that says: "Mike sells new shoes", and another note that says "Leo Johnson says "new shoes" when in a coma".. ideally these two notes would be related in some fashion (no pun intended). Of course this is a simple example, but I'm sure there would be notes that could be linked together based on one or many keywords, etc.. and I'd hope some sort of algorithm could point me in the right direction w/ enough linked notes/keywords/etc.. I hope that made some sense.

    I know some blogs allow you to tag posts w/ keywords, but a program would be cool and I want to challenge myself w/ creating aforementioned program.

    submitted by /u/parrotsnest
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    Can I optimize this code any further? Price of Products after Discounts

    Posted: 01 Sep 2021 09:01 PM PDT

    I recently did an online assessment and I'm wondering if I can optimize the code any further in terms of time and space compliexity:

    Problem:

    Input consists of 2 lists

    Products: [[20, 'discount1', 'discount2']], [15, 'discount2'], [10, 'NONE', 'discount1']]

    Discounts: [['discount1', 1, 30], ['discount2', 2, 5.5]]

    = = =

    Each product list consists of [product-price, discount-name, discount-name, ....]

    Each discount list consist of [discount-name, discount-type, discount-amount]

    = = = =

    Discount-type 1: Take the discount amount as a percentage and subtract it from the product price

    Discount-type 2: Take the discount amount as discount price and subtract it from the product price

    = = =

    The goal is to determine the optimal price for each product and sum it to the total price. As each optimal price is calculated, I round it to the nearest integer.

    Ex: (using the above 2 lists)

    Take product 1, which is $20. Apply 'discount1'. 'discount1' is type 1 so do the following 20 - 20(.30) = 14 -> Math.round(14) = 14

    Now apply 'discount2'. 'discount2' is type 2 so do the following 20 - 5.5 = 14.5 -> Math.round(14.5) = 15

    Since 14 < 15, I take 14 as the optimal price for product 1 and add it to a finalPrice variable. I do this for the rest of the products

    ```

    ​

    public class Solution { static class DisHelper { int type; double d; DisHelper(int type, double d) { this.type=type; this.d=d; } } public static int Price(List<List<String>> products, List<List<String>> discounts) { int finalPrice=0; HashMap<String, DisHelper> map = new HashMap<>(); for(List<String> list: discounts) { map.put(list.get(0), new DisHelper(Integer.parseInt(list.get(1)), Double.parseDouble(list.get(2)))); } for(List<String> list: products) { double originalPrice = Double.parseDouble(list.get(0)); double optimalPrice = originalPrice; for(int i=1;i<list.size();i++) { if(list.get(i).equals("NONE")) { continue; } double price1=originalPrice; DisHelper subDisObj = map.get(list.get(i)); if(subDisObj.type==1) { price1=Math.round(price1-(price1*(subDisObj.d/(double)100))); } else if(subDisObj.type==2) { price1=Math.round(price1-subDisObj.d); } optimalPrice=Math.min(optimalPrice, price1); } finalPrice+=(int)optimalPrice; } return finalPrice; } public static void main(String[] args) { List<List<String>> products = new ArrayList<>(); List<List<String>> discounts = new ArrayList<>(); products.add(new ArrayList<>(List.of("20", "discount1", "discount2"))); products.add(new ArrayList<>(List.of("15", "discount2"))); products.add(new ArrayList<>(List.of("10", "NONE", "discount1"))); discounts.add(new ArrayList<>(List.of("discount1", "1", "30"))); discounts.add(new ArrayList<>(List.of("discount2", "2", "5.5"))); System.out.println(Price(products, discounts)); } }

    ```

    Analysis

    Say we have M products, N discounts, and k discount names for each product.

    Populating HashMap: O(N)

    Going through each product: O(M)

    Going through each discount (for each product) O(M * k)

    Time complexity: O(N+M*k))

    ​

    Space Complexity: O(N) for Hashmap.

    ​

    Are the time and space complexities correct?

    Can I optimize this code?

    submitted by /u/reddit-user116
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    How to migrate my local hosted bitnami website to another computer ?

    Posted: 01 Sep 2021 02:30 PM PDT

    I'm just a newbie so sorry if I don't express myself well, I started making a wordpress website just for fun, hosted it with bitnami in my C drive and was pretty happy with the result. Now I bought a new computer and wanted to move it and host it locally there to keep working on it, but idk how to do it. I copied and pasted the bitnami folder, and tried installing bitnami again, but none would work.

    If anyone could help me please, thanks.

    submitted by /u/6bootysurfer9
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    Should I learn C and C++ before Python

    Posted: 01 Sep 2021 02:54 AM PDT

    Hi there. I had started to learn Python and then I found a curriculum of MIT and some other sources said that one should learn C and C++ first to be a good developer. Do you think this is really matter what language to learn first? I would like to do it properly in the long term. And what else should I learn from the very beginning except of programming language and math (I learn Calculus)?

    submitted by /u/Mike_Paradox
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    Executing and Modifying ELF binaries in C

    Posted: 01 Sep 2021 06:41 PM PDT

    Is the any library or method that easily allows for executing and modifying static and dynamic ELF binaries in c++? Also are there anyways to execute and modify other binaries in c++.

    When I mean modifying binaries I do not mean permanently modifying a binary but instead taking a certain line of code and replacing it with another in the binary when executed.

    submitted by /u/Adventurous-Can4429
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    So I am looking to use a Pi Kubernetes cluster to run a codebase alongside an NGROK server. How would I achieve this after following the below tutorial?

    Posted: 01 Sep 2021 02:43 PM PDT

    So the tutorial I found shows how to link several Pi's together. I have 3 Pi's I want to link to run a codebase I can access wirelessly through an HTTP GET request to an NGROK server I also plan to run on the Pi cluster. I am asking - how could I run these programs?

    I am not familiar with clusters, so forgive me if this comes across as a naive or obvious question. I have done research but nothing returned a clear answer.

    Thank you for your time and insight into this matter.

    submitted by /u/blevlabs
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    Peer to peer decentralized interactive marketplace for the buying and selling of digital goods

    Posted: 01 Sep 2021 08:35 PM PDT

    I've been thinking about an interactive website that has the functionality of an "eBay" or "Amazon" but with the addictive traits of a game. Maybe implement a reward system where players can earn free digital items as an incentive. If you still can't get the picture imagine a website that's only a marketplace but skinned as a game. Similar to any marketplace of an actual game, basically club penguin but a marketplace.

    submitted by /u/newworld-nwv
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    Those of you who write spam catching software: are messages with odd accented letters in place of regular letters harder to detect as spam?

    Posted: 01 Sep 2021 10:51 AM PDT

    Found this in a different subreddit.

    I have always assumed this was about fooling automated spam software. Does it matter at all?

    I looked at 6 other subs for this and this one seemed like the most appropriate 🤷‍♂️

    submitted by /u/ryhaltswhiskey
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    creating an API in asp.net

    Posted: 01 Sep 2021 08:17 AM PDT

    I am currently in the process of starting to build a rest API in ASP.NET, however i do not know if i should use ASP.NET CORE or ASP.NET Framework to create my API.

    ​

    Any help ?

    submitted by /u/jordanfisher1997
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    Controlling the browser's password manager suggestion

    Posted: 01 Sep 2021 06:03 AM PDT

    Is there a way to control the login data suggested to the user by the browser?

    What I mean is: when the user completes signing up in my website, how do I control which piece of data is saved as the username? The sign up form has a lot of fields (name, email, SSN, etc) and the data suggested by the browser is random (sometimes it suggests the name as the username, sometimes the email, sometimes the SSN), and I'd like to make it always suggest the email.

    ​

    How do I control this behavior? (Sorry if it's hard to understand, this sub doesn't allow images and english is not my first language)

    submitted by /u/furca14
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    When stacking image editing operations, in what order does Lightroom like software apply each operation?

    Posted: 01 Sep 2021 12:14 PM PDT

    I'm currently developing a barebones lightroom like software as a personal project. I've made brightness, hue, saturation sliders etc... Moving the sliders needs to be non destructive - so you can reset the image by moving sliders back and forth in an order that doesn't matter.

    What is unknown to me is what pixel collection reference does each manipulation use when stacking multiple operations. My best guess is storing the edited version of the image in one state and then applying each manipulation to that state. I'm just not sure if Lightroom does it that way as it seems that it may cause some problems.

    submitted by /u/SAGEMOD
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    Programming project ideas

    Posted: 01 Sep 2021 11:41 AM PDT

    I have run out of programming project ideas. I have done things including a chess engine, mods for games, and a chat application for Mixer (rip). Does anyone have any suggestions.

    submitted by /u/benjazzy64
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    Issues with tkinter checkboxes and radio buttons

    Posted: 01 Sep 2021 11:35 AM PDT

    Recently got started with some tkinter, and anytime I use something like checkboxes, or radiobuttons, these widgets never "check" visually, although they do change their state internally. Haven't found any clues as to why, but have checked in openSUSE and Win10. (only openSUSE) You guys have any ideas?

    submitted by /u/KelebMor
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    Best database for firebase like usecase?

    Posted: 01 Sep 2021 11:28 AM PDT

    Firebase provided a simple to use interface, however, now that my project is scaling I want to move away from Firebase due to the limitations that come with it. Chief among them is the cost per transaction.

    Since my firebase firestore had a lot of nested data i.e. maps within maps, what would be the best solution to move to? I thought a simple MySQL would do but I realised that I would have to have nested tables which would mean my query time would increase and I am trying to give the user a fast experience when calling APIs

    Thanks

    submitted by /u/clueless_robot
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    How the hell do I use containers without using Docker?

    Posted: 31 Aug 2021 10:29 PM PDT

    I am unable to figure this out. I hear about the downward trend of Docker, but I have no clue how to use containers without using Docker.

    I am aware of the OCI standard for containers, but again, I can't find anything on this stuff.

    What am I missing?

    submitted by /u/RippingMadAss
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    Can anybody tell me what is embedded android device are called, like Foodpanda Vendor Device.

    Posted: 01 Sep 2021 07:50 AM PDT

    If you have seen any food delivery system, like foodpanda, you might have seen the restaurant owners uses an android device, which is embedded with only foodpanda apps, and simple default ROM settings.

    I want to know what are these devices called, in order to research about building them. Or if anyone know how to build them, can share.

    submitted by /u/dgvai
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    Can someone explain implement function concept through code.

    Posted: 01 Sep 2021 07:28 AM PDT

    New in programming how to understand and make games

    Posted: 01 Sep 2021 05:04 AM PDT

    Hi so im wondering im learning programming from youtube or should i say coding since its the only way i see it i use python i heard its good for beginners and i was wondering how do people know what to do and what to type in coding ?

    submitted by /u/YT_THEJASONKING
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    Pytesseract - using .traineddata file on hosted server (Heroku)

    Posted: 01 Sep 2021 04:42 AM PDT

    Hi Reddit,

    I have a Vue, Django integrated project. I hosted the Vue project on Netlify and the Django project on Heroku. A python script (integrated into Heroku) is called on certain buttons which extract data and posts this to the Django API to be viewed on the frontend.

    I have trained a font type for my pytesseract OCR script. However, when i run it on Heroku, it seems like i can only use the 'eng' (normal font) as 'language' for my pytesseract image_to_string function. If I have the .traineddata file of the font type that I want to use, how can I use this file within the pytesseract functions? I can call the individual file, but I need the right TESSDATA_PREFIX as well. Does someone know how to deal with this?

    Thanks!

    submitted by /u/FirmBobcat9896
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    Engineers of Reddit, how has being strong at Algorithms helped you throughout the years?

    Posted: 01 Sep 2021 04:24 AM PDT

    Except for the interviews, has there been any moment when you've gone 'woah' when you used an algorithm that you had learned before?

    submitted by /u/yashsq
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    What would you use to organize non-production, company-specific tools and scripts developed by different employees?

    Posted: 01 Sep 2021 04:23 AM PDT

    At work, many employees develop various scripts and tools to automate their daily work. They are not "production" tools, they live only on the employee's machine. These are things like "get setting from our configuration system" or "perform item search according to custom criteria" etc. Some are very simple, others more complex.

    As we create many applications at different "levels" (from FE to BE to some CLI computing applications), we use multiple programming languages. For this reason, these tools are also being developed in many languages. Some are bash scripts, others are python or c #, and even rust and ruby.

    I see a couple of issues with this that I'd like to fix. I don't think I'm the first person to face such a problem :) Do you know any existing solutions that would at least solve the following problems:

    • simplicity - bash scripts are extremely easy to write (and difficult to read btw.), therefore this is the first choice for many developers and other techies. Each new solution must make tool development at least as simple or simpler as bash

    • discoverability - things like auto-generated CLI and/or autocomplete and/or GUI and/or documentation so new users can easily find what they need

    • conducting - incl. if I had to type ./find-item --db products --name foo it would be nice if just typing ./find-item asked the user for the missing parameters

    • maintainability - enforcing certain standards common to all projects. Eg how to provide configuration or user input.

    submitted by /u/sasik520
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