1603-design-parking-system.js

/**
 * 1603. Design Parking System
 * https://leetcode.com/problems/design-parking-system/
 * Difficulty: Easy
 *
 * Design a parking system for a parking lot. The parking lot has three kinds of parking
 * spaces: big, medium, and small, with a fixed number of slots for each size.
 *
 * Implement the ParkingSystem class:
 * - ParkingSystem(int big, int medium, int small) Initializes object of the ParkingSystem class.
 *   The number of slots for each parking space are given as part of the constructor.
 * - bool addCar(int carType) Checks whether there is a parking space of carType for the car that
 *   wants to get into the parking lot. carType can be of three kinds: big, medium, or small, which
 *   are represented by 1, 2, and 3 respectively. A car can only park in a parking space of its
 *   carType. If there is no space available, return false, else park the car in that size space
 *   and return true.
 */

/**
 * @param {number} big
 * @param {number} medium
 * @param {number} small
 */
var ParkingSystem = function(big, medium, small) {
  this.spaces = { 1: big, 2: medium, 3: small };
};

/**
 * @param {number} carType
 * @return {boolean}
 */
ParkingSystem.prototype.addCar = function(carType) {
  if (this.spaces[carType] > 0) {
    this.spaces[carType]--;
    return true;
  }
  return false;
};