@alexaegis/advent-of-code-lib/map.js

Advent of Code Library

const mapGetOrSet = (map, key, initialize) => {
  const value = map.get(key);
  if (value) {
    return value;
  } else {
    const newValue = initialize(key);
    map.set(key, newValue);
    return newValue;
  }
};
Map.prototype.print = function() {
  console.info(this.toString());
};
Map.prototype.toString = function() {
  return JSON.stringify(this.intoDictionary());
};
Map.prototype.keyArray = function() {
  return [...this.keys()];
};
Map.prototype.valueArray = function() {
  return [...this.values()];
};
Map.prototype.entryArray = function() {
  return [...this.entries()];
};
Map.prototype.intoDictionary = function() {
  return Object.fromEntries(this.entries());
};
Map.prototype.copy = function() {
  return new Map(this.entries());
};
Map.prototype.update = function(key, change) {
  this.set(key, change(this.get(key)));
  return this;
};
Map.prototype.findKey = function(value) {
  return [...this.entries()].find((e) => e[1] === value);
};
Map.prototype.getOrAdd = function(key, initialize) {
  return mapGetOrSet(this, key, initialize);
};
Map.prototype.isTheSameAs = function(other) {
  return [...this.keys()].every((key) => this.get(key) === other.get(key));
};
export {
  mapGetOrSet
};