How to get an array that contains the text values for all matching nodes in Playwright?

// https://playwright.dev/docs/api/class-locator#locator-all-text-contents

const texts = await page.getByRole('link').allTextContents();

Custom config for MariaDB

#/etc/mysql/mariadb.conf.d/99-custom.cnf
# for 1Gb RAM
# for lightweight OLTP
[mysqld]

# ---------------------------
# BASIC
# ---------------------------
bind-address = 127.0.0.1
skip-name-resolve
max_connections = 40
thread_cache_size = 16

# ---------------------------
# MEMORY CONTROL (1GB RAM)
# ---------------------------
innodb_buffer_pool_size = 512M
innodb_buffer_pool_instances = 1
innodb_log_file_size = 256M
innodb_log_buffer_size = 32M

tmp_table_size = 32M
max_heap_table_size = 32M

Optimize InnoDB tables in MariaDB

# Cron config
```cron
00 03 * * 1 /usr/local/bin/mariadb-optimize.sh
```
In MariaDB 10.6+, `OPTIMIZE TABLE` for InnoDB =
`ALTER TABLE ... FORCE`, i.e., rebuild table.\
**Do not do this often!!!**\
**Recommendation**: once a week during a low-load period.

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Healthcheck for MariaDB

#!/bin/bash
#/usr/local/bin/mariadb-healthcheck.sh

DB_USER="healthcheck"
DB_PASS="strong_password_here"
SOCKET="/run/mysqld/mysqld.sock"

LOG_FILE="/var/log/mariadb-healthcheck.log"
DATE=$(date '+%Y-%m-%d %H:%M:%S')

# Ping сервісу
mysqladmin --user="$DB_USER" --password="$DB_PASS" --socket="$SOCKET" ping > /dev/null 2>&1

if [ $? -ne 0 ]; then
    echo "$DATE - MariaDB ping failed. Attempting restart..." >> $LOG_FILE

    systemctl restart mariadb.service
    sleep 5

    mysqladmin --user="$D

Add systemd auto-restart

## Add systemd auto-restart
- Create override config file: \
`touch /etc/systemd/system/mariadb.service.d/auto-restart.conf`
- Add to the file follow text: 
```systemd
[Service]
Restart=always
RestartSec=5s
```      
- apply changes of unit and restart unit: \
`systemctl daemon-reload`\
`systemctl restart mariadb.service`

GeoIpUpdater by MaxMind: install and configure


## Install geoipupdater
- Install PPA \
`sudo add-apt-repository ppa:maxmind/ppa`
- Install package \
`sudo apt update && sudo apt install geoipupdate -y`

## Configure geoipupdater
- Log in to [maxmind.com](https://www.maxmind.com/en/home)
- Get your [config file](https://www.maxmind.com/en/accounts/current/license-key/GeoIP.conf)
- Get or generate new license key from [here](https://www.maxmind.com/en/accounts/current/license-key)
- Add/Replace/Uncomment in your GeoIP.conf:
    - **license ke

1680. Concatenation of Consecutive Binary Numbers

Given an integer n, return the decimal value of the binary string formed by concatenating the binary representations of 1 to n in order, modulo 109 + 7.
/**
 * @param {number} n
 * @return {number}
 */
var concatenatedBinary = function(n) {
    const MOD = 1_000_000_007;
    let ans = 0;
    let bitLength = 0;
    let pow2 = 1; // this will always store 2^bitLength % MOD

    for (let i = 1; i <= n; i++) {
        // If i is a power of two, bitLength increases
        if ((i & (i - 1)) === 0) {
            bitLength++;
            pow2 = (pow2 * 2) % MOD; // update 2^bitLength safely
        }

        // Shift left by multiplying with pow2 (ins

Maven Plugin - FatJar

Erestellt eine FatJar In BUILD | PLUGIN Sektion der pom.xml <build> <plugins> ... </plugins> </build>
<build>
  <plugins>
      <!-- FatJar -MVN-Plugin -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.5.0</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
    

how to check if a the dropdown options are sorted?

test("Dropdown should be sorted in alphabetical order", async ({ page }) => {
    await page.goto(PAGE_URL);
    const dropdown = page.getByRole("combobox").and(page.locator("#country"));
    const options = await dropdown.locator("option").all();
    const optionValues = await Promise.all(options.map(option => option.textContent()));
    const sortedOptionValues = [...optionValues].sort();
    expect(optionValues).toEqual(sortedOptionValues);
});

How to run test on Playwright and see the test on the browsers

// adding --headed option
npx playwright test tests/singleSelectDropdown.spec.ts --headed

How to select a select element in playwright?

// page.getByRole("combobox")
test("Single select dropdown actions", async ({ page }) => {
  await page.goto(PAGE_URL);
  const dropdown = page.getByRole("combobox").and(page.locator("#country"));
  await dropdown.selectOption("India");
});

How to select a select option in Playwright?

Selects one or multiple options in the <select> element with locator.selectOption(). You can specify option value, or label to select. Multiple options can be selected.

// Single selection matching the value or label
await page.getByLabel('Choose a color').selectOption('blue');

// Single selection matching the label
await page.getByLabel('Choose a color').selectOption({ label: 'Blue' });

// Multiple selected items
await page.getByLabel('Choose multiple colors').selectOption(['red', 'green', '

cn, cva, clx

// 1 install
npm install class-variance-authority clsx tailwind-merge

// 2 /lib/utils.ts
/*
clsx handles conditional logic and class composition
tailwind-merge removes conflicting Tailwind classes
*/

import { clsx } from "clsx"
import { twMerge } from "tailwind-merge"

cn("px-2 px-4") // => "px-4"


// 3 variant with cva
import { cva } from "class-variance-authority"
import { cn } from "@/lib/utils"

const buttonVariants = cva(
  "rounded px-4 py-2 font-medium transition",
  {
    variants: {

Zustand

// 1 install
npm install zustand

// 2 create
// store.js
import { create } from 'zustand';

const useStore = create((set) => ({
  count: 0, // Initial state
  increase: () => set((state) => ({ count: state.count + 1 })),
  decrease: () => set((state) => ({ count: state.count - 1 })),
}));
export default useStore;

// 3 use
// App.js
import React from 'react';
import useStore from './store';

const Counter = () => {
  const { count, increase, decrease } = useStore((state) => ({
    count: state.

3666. Minimum Operations to Equalize Binary String

You are given a binary string s, and an integer k. In one operation, you must choose exactly k different indices and flip each '0' to '1' and each '1' to '0'. Return the minimum number of operations required to make all characters in the string equal to '1'. If it is not possible, return -1.
/**
 * @param {string} s
 * @param {number} k
 * @return {number}
 *
 * This solution is based on analyzing how many zeros can be flipped per operation.
 * Each operation flips exactly k bits, so the parity of the zero count changes
 * depending on k. The editorial shows that the minimum number of operations can be
 * computed using two candidate formulas depending on parity constraints.
 */
var minOperations = function (s, k) {
    const n = s.length;

    // Count how many zeros are in the str