karpolan

  // In main App or Layout component add following:

  const isMobile = useMediaQuery({ maxWidth: 767 }); // From react-responsive, Material UI or other styling library

  useEffect(() => {
    // Due to SSR/SSG we can not set 'app-layout onMobile' or 'app-layout onDesktop' on the server
    // If we modify className using JS, we will got Warning: Prop `className` did not match. Server: "app-layout" Client: "app-layout onDesktop"
    // So we have to apply document.body.class using the hook :)
    if (isMobile) {
      document.body.classList.remove('onDesktop');

karpolan

import log from 'loglevel';

log.setLevel(process.env.LOG_LEVEL || process.env.REACT_APP_LOG_LEVEL || log.levels.ERROR);
log.info('log.level:', Object.keys(log.levels)[log.getLevel()]);

// Internal cache for time() and timeEnd() calls
const _timers = {};

/**
 * Analog of console.time()

karpolan

import React from 'react'

/**
 * Renders "invisible" div to use as a first element in Material UI Menu, and other popup components who obtain
 * a DOM ref from the child component. This allows to avoid: "Warning: Function components cannot be given refs.
 * Attempts to access this ref will fail. Did you mean to use React.forwardRef()"
 * @class InvisibleRef
 */
const InvisibleRef = React.forwardRef((props, ref) => {
  const styleInvisible = {

karpolan

import { useMemo } from 'react';

const sortByAbc = ([a], [b]) => a.localeCompare(b);
const sortByZxy = ([a], [b]) => b.localeCompare(a);
const sortNone = () => 0;

/**
 * Renders <ul> list with all properties of the given JavaScript object
 * @param {object} object - object to print out
 * @param {boolean} [sortAbc] - properties sorted A-Z when true

karpolan

version: "3.8"
services:

  # PostgeSQL server is running on localhost:8200
  postgres:
    image: postgres
    restart: always
    environment:
      POSTGRES_PASSWORD: postgres
      POSTGRES_USER: postgres

karpolan

const UNMISTAKABLE_CHARS = "23456789ABCDEFGHJKLMNPQRSTWXYZabcdefghijkmnopqrstuvwxyz";
const BASE64_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" + "0123456789-_";

karpolan

// For https://www.hackerrank.com/challenges/climbing-the-leaderboard/problem

function climbingLeaderboard(scores, alice) {

    let positionsCount = 1;
    const uscores = [scores[0]]; // Unique scores only, shorter array
    scores.reduce((prev, curr) => {
        if (prev != curr) {
            positionsCount++;
            uscores.push(curr)

karpolan

import React from 'react';
import { CircularProgress, LinearProgress } from '@material-ui/core/';

/**
 * Wraps the React Component with React.Suspense and FallbackComponent while loading.
 * @param {React.Component} WrappedComponent - lazy loading component to wrap.
 * @param {React.Component} FallbackComponent - component to show while the WrappedComponent is loading.
 */
export const withSuspense = (WrappedComponent, FallbackComponent = null) => {
	return class extends React.Component {

karpolan

/* eslint-disable import/prefer-default-export */
/* eslint-disable no-param-reassign */

/**
 * Shuffles array in place. ES6 version.
 * @param {Array} a - array containing all items to shuffle.
 */
export function shuffle(a) {
  for (let i = a.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));