fronterior

function * backTracking(...args) {
  const r = [[]];
  while (r.length) {
    const t = r.shift();
    if (t.length === args.length) yield t;
    else r.unshift(...args[t.length].map(i => [...t, i]));
  }
}
const iter = backTracking([true, false], [1, 2, 3], [3, 4, 5, 6, 7], ['a', 'b'], ['c']);
[...iter];

fronterior

const args = [
  [1,2,3],
  [1],
  ['a', 'b'],
  ['c', 'd', 'e'],
  [5],
];

const r = [[]] as any;
let i = 0;

fronterior

const createRangePagination = (page: number, limit: number, total: number, range: number) => {
  const size = range * 2 + 1;
  const maxPage = Math.ceil(total / limit);
  const start = range >= page ? 1
    : maxPage - range < page ? maxPage - size + 1
    : page - range;
  const end = size > page + range ? size 
    : maxPage < page + range ? maxPage
    : page + range;
  return Array.from({length: end - start + 1}, (_, i) => i + start);

fronterior

import { useEffect, RefObject } from 'react';

const useOutsideClick = <T extends HTMLElement>(f: (ev: MouseEvent) => void, ref: RefObject<T>) => {
  useEffect(() => {
    const upHandler = (ev: MouseEvent) => {
      ev.stopPropagation();
      document.removeEventListener('click', upHandler, true);
      f(ev);
    };
    const downHandler = (ev: PointerEvent) => {

fronterior

const createPaginationIndex = (currentPage: number, total: number, limit = 10, listLength = 10) => {
  const totalPages = Math.ceil(total / limit);
  const startSetIndex = Math.floor((currentPage - 1) / listLength);
  const startList = listLength * startSetIndex + 1;

  const length = startList + listLength - 1 > totalPages ? 
    listLength - (startList + listLength - 1 - totalPages) : 
    listLength;
  
  return {

fronterior

const fileSystemEntryParse = async (data: FileSystemEntry|DataTransferItemList) => {
  const entries = data instanceof DataTransferItemList ? [...data].map(dataTransferItem => dataTransferItem.webkitGetAsEntry()) : [data];
  const stack = [...entries];
  let target: FileSystemEntry;

  const result: File[] = [];

  while (target = stack.shift() as FileSystemEntry) {
    if (target.isDirectory) {
      const reader = (target as FileSystemDirectoryEntry).createReader();

fronterior

export type ParenthesisPosition = [number, number, ParenthesisPosition[]];
export const parenthesisParse = (str: string) => {
  let cursor = -1;
  const result: ParenthesisPosition[] = [];
  const stack: ParenthesisPosition[] = [];

  let error = '';
  while (!error) {
    if (!stack.length) {
      const startIndex = str.indexOf('(', cursor + 1);

fronterior

const [N,M] = [5, 2];
const contextStack: number[][] = [];
const stack = Array.from({length: N}, (_,i) => i + 1);
const result: number[] = [];
let target: number;
let isEnd = false;
while (1) {
  // When one case is completed
  if (result.length === M) {
    console.log(result.join(' '));

fronterior

// Node.js & Electron reference : https://stackoverflow.com/a/58473299
// C++ reference : https://stackoverflow.com/a/65052538
// Environment:
// - Windows 10
// - Nodejs v14.17.6
// Dependencies:
// - [email protected]
// - [email protected]
// - [email protected]
// - [email protected]

fronterior

// Focusrite-Novation Launchpad Mini
const midiDeviceMap = {};
const midi = await navigator.requestMIDIAccess();
midi.inputs.forEach(entry => {
  const key = entry.manufacturer+entry.name+entry.version;
  if (!midiDeviceMap[key]) midiDeviceMap[key] = {};
  midiDeviceMap[key].input = entry;
});
midi.outputs.forEach(entry => {
  const key = entry.manufacturer+entry.name+entry.version;