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Selected element within list in React

I want to apply different style for selected element from a long list. I’m passing to React component element as props: currentId and selectedId. Inside render function, I compare both ids and apply proper styles. When clicking any element from the list, I fire an action with the new selected Id and all elements in the list will re-render(because selectedId prop does change). If the list has 1000 element and I click one of them, It would be nice to only update 2 elements (new selected and deselected ones) not all of them. Is these a better way to handle this scenario in React? Selected element within list in React Selected element within list in React test {$excerpt:n}

How can I Input varibale length string and output user defined length string?

AS some function like MD5 can take input of varibale length string, and output a fixed length string. I want some standard function that can input a differents string and output a user deined length. Is there any way to do so? How can I Input varibale length string and output user defined length string? How can I Input varibale length string and output user defined length string? test {$excerpt:n}

TypeError: only size-1 arrays can be converted to Python scalars as I try to find equation values

I am trying to solve a simple equation: x^2 - 4 = 0 using fslolve. from scipy.optimize import fsolve,leastsq import math import numpy as np f = lambda x : math.pow(x,2) - 4 fsolve(f, np.linspace(0,1,10)) But I get an error saying TypeError: only size-1 arrays can be converted to Python scalars. I cannot understand the reason for this. Why do I get this error? TypeError: only size-1 arrays can be converted to Python scalars as I try to find equation values TypeError: only size-1 arrays can be converted to Python scalars as I try to find equation values test {$excerpt:n}

A compilation program

i am currently having a problem here. As of now, the current code only calls the Party Planner program and works with it by closing the current panel. However, when i launch the other four, the main frame opens but without any context and the menus serve no functions. I really dont want this to show up, so somebody please help me… import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Project extends JFrame implements ActionListener{ JFrame jf; FlowLayout fr; JMenuBar mainBar; JMenu menu; JMenuItem a, b, c, d, e, exit; JPanel currentPanel, otherPanel; JLabel currentLabel, otherLabel; Project(){ jf = new JFrame(); fr = new FlowLayout(); mainBar = new JMenuBar(); mainBar.setVisible(true); setTitle("Compilation"); setVisible(true); setSize(400,200); setDefaultClo...

Flutter : How to change status bar color when scrolling with SingleChildScrollView

I’m new with flutter. I’m creating a new page with SingleChildScrollView. my problem is how to change status bar color only when scrolling active? I’ve seen this effect from here but this code for sliver. everytime scroll active at some offset, the statusbar color change. here’s the example picture what I want achieve : screenshoot here’s my basic code : import 'package:flutter/material.dart'; class HomeScreen extends StatefulWidget { HomeScreen({Key key}) : super(key: key); _HomeScreenState createState() => _HomeScreenState(); } class _HomeScreenState extends State<HomeScreen> { @override void initState() { super.initState(); _scrollController = ScrollController(); _scrollController.addListener(_scrollListener); } @override void dispose() { _scrollCo...

Retrieving desired git commit message in pre-commit hook

So if .git/hooks/pre-commit exists, then it will be run right after: git commit -am "foobar" is run. So then how do I access the desired git commit message in the pre-commit? I do some sleuthing and put this in .git/hooks/pre-commit and made the file executable: #!/usr/bin/env bash echo "here is pre-commit hook" env | sort echo "args:" echo $@ exit 1; here are the env vars that are prefixed with “GIT” GIT_AUTHOR_DATE=@1558245421 -0700 GIT_AUTHOR_EMAIL=alex@alexs-mac.local GIT_AUTHOR_NAME=Alexander Mills GIT_EDITOR=: GIT_EXEC_PATH=/Library/Developer/CommandLineTools/usr/libexec/git-core GIT_INDEX_FILE=/Users/alex/codes/interos/notifier-server/.git/index.lock GIT_PREFIX= and there seem to be no arguments to the script, because nothing gets logged after echo "args:"… so how ...

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