alekstar79

const hash = (() => {
  const makeCRCTable = () => {
    let c
    const crcTable = []
    for(let n = 0; n < 256; n++) {
      c = n;
      for(let k = 0; k < 8; k++) {
        c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1))
      }
      crcTable[n] = c

alekstar79

[
  {
    "id":"8",
    "hex_color":"FFCD1C",
    "name":"Калининская",
    "stations":[
      {
        "id":"8.189",
        "name":"Новокосино",
        "lat":55.745113,

alekstar79

function zip(...arrays) {
  const maxLength = Math.max(...arrays.map(array => array.length))
  
  return Array.from({ length: maxLength }).map((_, i) => {
    return Array.from({ length: arrays.length }, (_, j) => arrays[j][i])
  })
}


// Define the arrays that contain the coordinates

alekstar79

function omit(obj, keys) {
  return Object.keys(obj)
    .filter(key => !keys.includes(key))
    .reduce((acc, key) => {
      acc[key] = obj[key]
    
      return acc
    }, {})
}

alekstar79

function pick(obj, keys) {
  return keys.reduce((acc, key) => {
    if (obj.hasOwnProperty(key)) {
      acc[key] = obj[key]
    }
    
    return acc
  }, {})
}

alekstar79

function pipe(...fn) {
  return function piped(...args) {
    return fn.reduce((result, f) => [f.call(this, ...result)], args)[0]
  }
}

alekstar79

const h2sl = (hex, isString) => {
  // Convert hex to RGB first
  let r = 0, g = 0, b = 0
  
  if (hex.length == 4) {
    r = "0x" + hex[1] + hex[1]
    g = "0x" + hex[2] + hex[2]
    b = "0x" + hex[3] + hex[3]
  } else if (hex.length == 7) {
    r = "0x" + hex[1] + hex[2]

alekstar79

/** @see https://gist.github.com/alekstar79/11125248f8dc609f5c8dcba3e0f75b5e */
import { createCachedFunction } from './cached.mjs'

/** @see https://gist.github.com/alekstar79/042a211b62203f1439f2012ce6aa9f55 */
import { workerInit } from './worker.mjs'

/**
 * @param {function} worker
 * @return {function(*=): Promise<unknown>}
 * @example

alekstar79

/**
 * @param {Function} fn
 * @return {Function}
 */
export function createCachedFunction(fn)
{
    const handler = {
        cache: {},

        apply(target, that, args)

alekstar79

/**
* @param {Function} job
* @return {function(*=): Promise<unknown>}
*/
export function workerInit(job)
{
    const url = window.URL.createObjectURL(new Blob(
        [`"use strict";\nself.onmessage = ${job.toString()}`],
        { type: 'text/javascript' }
    ))