cettlers-of-satan/util.js

Shared client/server code for Cettlers of Satan, a dodgy remake of a popular board game.

exports.assertType = function(x, tipe, name) {
  if (typeof(x) !== tipe) {
    throw new Error(`${name} must be of type ${tipe}`);
  }
}

exports.assertEnum = function(x, enm, name) {
  for (var k of Object.keys(enm)) {
    if (x === enm[k]) {
      return;
    }
  }

  throw new Error(`${name} must be a valid enum value`);
}

exports.assertInstance = function(x, inst, name) {
  if (!(x instanceof inst)) {
    throw new Error(`${name} must be an instance of ${inst.name}`);
  }
}

exports.PairSet = class {
  constructor() {
    this.a = new Set();
    this.b = new Set();
  }

  add(x, y) {
    this.a.add(x);
    this.b.add(y);
  }

  has(x, y) {
    return this.a.has(x) && this.b.has(y);
  }
}