zhangr4

#!/usr/bin/env bash

REGEX_COMMIT_MSG='^(feat|fix|docs|style|refactor|perf|test|workflow|build|ci|chore|release|workflow)(\(.+\))?: .{1,50}';
# https://www.conventiona

if [[ $(<"$1")  =~ $REGEX_COMMIT_MSG ]]
then 
	echo "commit message match convention";
	exit 0;
fi

zhangr4

import pandas as pd

a = pd.DataFrame([1,2,2,3,3,3,1,1,2])

b = a.loc[:,0]
c = b.loc[b.shift()!=b]
print(c.tolist())

// https://stackoverflow.com/questions/19463985/pandas-drop-consecutive-duplicates

zhangr4

import java.util.function.Function;
import java.util.function.Predicate;
import java.util.regex.Pattern;
import java.util.stream.Stream;
import java.util.Arrays;

/* raw problem and better solution: 
 https://stackoverflow.com/questions/57836937/call-custom-static-functions-from-filter-and-map-in-java-8-stream
*/
class Solution {

zhangr4

public class quickSort {
    
    public static void main(String[] args) {
        int[] test = new int[]{5,1,1,2,0,0};        
        quickSortArr(test, 0, test.length-1);
        printArr(test);

    }

    public static void printArr(int[] arr) {

zhangr4

import java.util.Stack;

class Program {
    public static void main(String[] args) {
        
        for(int i = 0; i <= 10; i++) {
            System.out.print(fibonacci(i) + " ");
        }
        System.out.println();
        for(int i = 0; i <= 10; i++) {

zhangr4

# get internal ip address
ipconfig

# get external ip address
Invoke-WebRequest ifconfig.me

zhangr4

 Console.WriteLine();
//  <-- Keep this information secure! -->
Console.WriteLine("UserName: {0}", Environment.UserName);

//this one can get domain and user name
string userName = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
Console.WriteLine();
Console.WriteLine(userName);

zhangr4

A Summary of how to use httpClient in C#

httpClient class

Normal Use

httpClient class

Factory Pattern

why use HttpClientFactory

zhangr4

/* 
 * just for learning 
 * key concept, LinkedList
 * refer https://blog.csdn.net/qq_16587307/article/details/104301877
 * refer https://medium.com/@bonnotguillaume/software-architecture-the-pipeline-design-pattern-from-zero-to-hero-b5c43d8a4e60
 */

namespace pipeline
{
    public class Program

zhangr4

// https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-8.0/ranges

#region Indexable Example
//System.Index
// use '^' operator: means read from end = true
// '^' operator requires type is countable and have indexer:

interface IIndexable<T>{
    public int Length { get; } // need public property 'Length', which has get access 
    public T this[int index] { get; } // need public indexer, which takes a single int as the argument.