React Hook useState Not Updating UI

I am new to React Hooks and I’m trying to update the quantity in a shopping cart using the following code; import React, { useState, useEffect } from “react”; import cookie from “react-cookies”; import CheckoutItems from “./CheckoutItems”; import restHelper from “../../shared/RestHelper”; const Checkout = () => { const [cart, setCart] = useState(null); useEffect(() => {…

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Flutter Navigation Re-Render All Page in Histories Stack Page

I just realized that flutter re-render all pages in histories stack when navigation changes. In my case I don’t want to render page bottom of all my stack page histories. I just want to render my current page only. First Page Widget build(BuildContext context){ print(“1st page”); return RaisedButton(onPressed: goToSecondPage()) } Second Page Widget build(BuildContext context){…

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cant install pip package

I am trying to make my own python3 pip package. I uploaded it online with twine from my command line, and I can see it online here: https://pypi.org/project/example-pkg-martinbarker-test/ I am following this tutorial exactly, (except for changing the package name), but if I try to install the package with the instruction from the url: pip…

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How to generate z-scores separately for each factor level using a loop in R?

I would like to convert variable to z-scores. How to do that for each factor cell level separately using a loop? Example DATA: df = data.frame(Cell = c(rep(“13a”,5),rep(“1b”,5),rep(“5b”,5)), condition = rep(c(“a”,”b”,”c”,”d”,”e”),3), variable = c(58,55,36,29,53,57,53,54,52,52,45,49,48,46,45)) Is this a good start?… Maybe the loop is not necessary buy I would like to learn how to write loops……

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MacOS app with user-selected file read-write entitlement rejected from Mac App Store because SQLite creates a temp file when writing to database

I have a MacOS app that I want to put on the Mac App Store so it must be sandboxed. With the app the user creates multiple SQLite database files storing information they create, somewhat analogous to Excel Spreadsheet files but I am leveraging SQLite in my app to create, read, and edit the files.…

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