jonurry

function Promise_all(promises) {
  return new Promise((resolve, reject) => {
    let results = [];
    try {
      for (let i=0; i<promises.length; i++) {
        let last = (i === promises.length - 1);
        promises[i].then(value => {
          results[i] = value;
          if (last) resolve(results);
        }).catch(reject);

jonurry

// my solution
async function locateScalpel(nest) {
  let results = network(nest).map(async name => {
    // if the name of the nest that was last known to hold the scalpel
    // is the current nest then we have found the scalpel
    // else, return null
    if (name === await anyStorage(nest, name, 'scalpel')) {
      return name;
    } else {
      return null;

jonurry

const {buildGraph} = require("./graph");

const roads = [
  "Alice's House-Bob's House",   "Alice's House-Cabin",
  "Alice's House-Post Office",   "Bob's House-Town Hall",
  "Daria's House-Ernie's House", "Daria's House-Town Hall",
  "Ernie's House-Grete's House", "Grete's House-Farm",
  "Grete's House-Shop",          "Marketplace-Farm",
  "Marketplace-Post Office",     "Marketplace-Shop",
  "Marketplace-Town Hall",       "Shop-Town Hall"

jonurry

// regular expression:
// at the beginning of the number, optionally have '+' or '-'
// followed by a decimal or integer number:
//     one or more digits optionally followed by a decimal point followed by zero or more digits, or
//     a decimal point followed by one or more digits
// followed by (optionally) at the end of the number:
//     'e' followed by 
//     '+' or '-' (optional), followed by
//     one or more digits
// everything is case-insensitive (i) so 'e' or 'E' are both acceptable

jonurry

let text = "'I'm the cook,' he said, 'it's my job.'";
// ' at begining of string or
// ' after non-word character or
// ' before non-word character or
// ' at and of string
console.log(text.replace(/^'|(\W)'|'(\W)|'$\b/g, "$1\"$2"));
// → "I'm the cook," he said, "it's my job."

jonurry

// the letters 'ca' followed by one of 'r' or 't'
verify(/ca[rt]/,
       ["my car", "bad cats"],
       ["camper", "high art"]);

// 'p' optionally followed by 'r' followed by 'op'
verify(/pr?op/,
       ["pop culture", "mad props"],
       ["plop"]);

jonurry

const box = {
  locked: true,
  unlock() { this.locked = false; },
  lock() { this.locked = true;  },
  _content: [],
  get content() {
    if (this.locked) throw new Error("Locked!");
    return this._content;
  }
};

jonurry

class MultiplicatorUnitFailure extends Error {}

function primitiveMultiply(a, b) {
  if (Math.random() < 0.2) {
    return a * b;
  } else {
    throw new MultiplicatorUnitFailure("Klunk");
  }
}

jonurry

function logSetElements(value1, value2, set) {
  console.log('set[' + value1 + '] = ' + value2);
}

class PGroup {
  constructor(pg = new Set()) {
    this.group = pg;
  }
  add(item) {
    let g = PGroup.from(this.group);

jonurry

function runRobot(state, robot, memory) {
  for (let turn = 0; ; turn++) {
    if (state.parcels.length == 0) {
      return turn;
    }
    let action = robot(state, memory);
    state = state.move(action.direction);
    memory = action.memory;
  }
}