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# Reto #9: 🚂 El tren magico | ||
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Los elfos están jugando con un tren 🚂 mágico que transporta regalos. Este tren se mueve en un tablero representado por un array de strings. | ||
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El tren está compuesto por una locomotora (@), seguida de sus vagones (o), y debe recoger frutas mágicas (*) que le sirve de combustible. El movimiento del tren sigue las siguientes reglas: | ||
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Recibirás dos parámetros board y mov. | ||
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board es un array de strings que representa el tablero: | ||
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@ es la locomotora del tren. | ||
o son los vagones del tren. | ||
* es una fruta mágica. | ||
· son espacios vacíos. | ||
mov es un string que indica el próximo movimiento del tren desde la cabeza del tren @: | ||
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'L': izquierda | ||
'R': derecha | ||
'U': arriba | ||
'D': abajo. | ||
Con esta información, debes devolver una cadena de texto: | ||
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'crash': Si el tren choca contra los bordes del tablero o contra sí mismo. | ||
'eat': Si el tren recoge una fruta mágica (*). | ||
'none': Si avanza sin chocar ni recoger ninguna fruta mágica. | ||
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```js | ||
const board = [ | ||
'·····', | ||
'*····', | ||
'@····', | ||
'o····', | ||
'o····' | ||
] | ||
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console.log(moveTrain(board, 'U')) | ||
// ➞ 'eat' | ||
// Porque el tren se mueve hacia arriba y encuentra una fruta mágica | ||
``` |
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/** | ||
* For a detailed explanation regarding each configuration property, visit: | ||
* https://jestjs.io/docs/configuration | ||
*/ | ||
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/** @type {import('jest').Config} */ | ||
const config = { | ||
// All imported modules in your tests should be mocked automatically | ||
// automock: false, | ||
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// Stop running tests after `n` failures | ||
// bail: 0, | ||
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// The directory where Jest should store its cached dependency information | ||
// cacheDirectory: "/tmp/jest_rs", | ||
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// Automatically clear mock calls, instances, contexts and results before every test | ||
clearMocks: true, | ||
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// Indicates whether the coverage information should be collected while executing the test | ||
// collectCoverage: false, | ||
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// An array of glob patterns indicating a set of files for which coverage information should be collected | ||
// collectCoverageFrom: undefined, | ||
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// The directory where Jest should output its coverage files | ||
// coverageDirectory: undefined, | ||
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// An array of regexp pattern strings used to skip coverage collection | ||
// coveragePathIgnorePatterns: [ | ||
// "/node_modules/" | ||
// ], | ||
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// Indicates which provider should be used to instrument code for coverage | ||
coverageProvider: 'v8', | ||
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// A list of reporter names that Jest uses when writing coverage reports | ||
// coverageReporters: [ | ||
// "json", | ||
// "text", | ||
// "lcov", | ||
// "clover" | ||
// ], | ||
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// An object that configures minimum threshold enforcement for coverage results | ||
// coverageThreshold: undefined, | ||
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// A path to a custom dependency extractor | ||
// dependencyExtractor: undefined, | ||
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// Make calling deprecated APIs throw helpful error messages | ||
// errorOnDeprecated: false, | ||
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// The default configuration for fake timers | ||
// fakeTimers: { | ||
// "enableGlobally": false | ||
// }, | ||
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// Force coverage collection from ignored files using an array of glob patterns | ||
// forceCoverageMatch: [], | ||
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// A path to a module which exports an async function that is triggered once before all test suites | ||
// globalSetup: undefined, | ||
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// A path to a module which exports an async function that is triggered once after all test suites | ||
// globalTeardown: undefined, | ||
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// A set of global variables that need to be available in all test environments | ||
// globals: {}, | ||
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// The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers. | ||
// maxWorkers: "50%", | ||
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// An array of directory names to be searched recursively up from the requiring module's location | ||
// moduleDirectories: [ | ||
// "node_modules" | ||
// ], | ||
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// An array of file extensions your modules use | ||
moduleFileExtensions: ['js', 'mjs', 'cjs', 'jsx', 'ts', 'tsx', 'json', 'node'], | ||
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// A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module | ||
// moduleNameMapper: {}, | ||
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// An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader | ||
// modulePathIgnorePatterns: [], | ||
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// Activates notifications for test results | ||
// notify: false, | ||
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// An enum that specifies notification mode. Requires { notify: true } | ||
// notifyMode: "failure-change", | ||
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// A preset that is used as a base for Jest's configuration | ||
// preset: undefined, | ||
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// Run tests from one or more projects | ||
// projects: undefined, | ||
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// Use this configuration option to add custom reporters to Jest | ||
// reporters: undefined, | ||
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// Automatically reset mock state before every test | ||
// resetMocks: false, | ||
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// Reset the module registry before running each individual test | ||
// resetModules: false, | ||
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// A path to a custom resolver | ||
// resolver: undefined, | ||
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// Automatically restore mock state and implementation before every test | ||
// restoreMocks: false, | ||
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// The root directory that Jest should scan for tests and modules within | ||
// rootDir: undefined, | ||
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// A list of paths to directories that Jest should use to search for files in | ||
roots: ['<rootDir>'], | ||
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// Allows you to use a custom runner instead of Jest's default test runner | ||
// runner: "jest-runner", | ||
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// The paths to modules that run some code to configure or set up the testing environment before each test | ||
// setupFiles: [], | ||
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// A list of paths to modules that run some code to configure or set up the testing framework before each test | ||
// setupFilesAfterEnv: [], | ||
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// The number of seconds after which a test is considered as slow and reported as such in the results. | ||
// slowTestThreshold: 5, | ||
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// A list of paths to snapshot serializer modules Jest should use for snapshot testing | ||
// snapshotSerializers: [], | ||
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// The test environment that will be used for testing | ||
// testEnvironment: "jest-environment-node", | ||
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// Options that will be passed to the testEnvironment | ||
// testEnvironmentOptions: {}, | ||
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// Adds a location field to test results | ||
// testLocationInResults: false, | ||
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// The glob patterns Jest uses to detect test files | ||
testMatch: ['**/__tests__/**/*.[jt]s?(x)', '**/?(*.)+(spec|test).[tj]s?(x)'], | ||
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// An array of regexp pattern strings that are matched against all test paths, matched tests are skipped | ||
testPathIgnorePatterns: ['/node_modules/'], | ||
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// The regexp pattern or array of patterns that Jest uses to detect test files | ||
// testRegex: [], | ||
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// This option allows the use of a custom results processor | ||
// testResultsProcessor: undefined, | ||
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// This option allows use of a custom test runner | ||
// testRunner: "jest-circus/runner", | ||
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// A map from regular expressions to paths to transformers | ||
transform: { | ||
'\\.[jt]sx?$': 'babel-jest', | ||
}, | ||
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// An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation | ||
// transformIgnorePatterns: [ | ||
// "/node_modules/", | ||
// "\\.pnp\\.[^\\/]+$" | ||
// ], | ||
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// An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them | ||
// unmockedModulePathPatterns: undefined, | ||
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// Indicates whether each individual test should be reported during the run | ||
// verbose: undefined, | ||
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// An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode | ||
// watchPathIgnorePatterns: [], | ||
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// Whether to use watchman for file crawling | ||
// watchman: true, | ||
} | ||
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module.exports = config |
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const board = ['·····', '*····', '@····', 'o····', 'o····'] | ||
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export function moveTrain(board, mov) { | ||
for (let i = 0; i < board.length; i++) { | ||
const row = board[i] | ||
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for (let j = 0; j < row.length; j++) { | ||
const cell = row[j] | ||
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if (cell === '@') { | ||
const nextRow = board[i + 1] || [] | ||
const prevRow = board[i - 1] || [] | ||
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const nextCell = nextRow[j] | ||
const prevCell = prevRow[j] | ||
const nextCellRight = row[j + 1] | ||
const prevCellRight = row[j - 1] | ||
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if (mov === 'U') { | ||
if (prevCell === '*') return 'eat' | ||
if (!prevCell || prevCell === 'o') return 'crash' | ||
if (prevCell === '.') return 'none' | ||
} | ||
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if (mov === 'D') { | ||
if (nextCell === '*') return 'eat' | ||
if (!nextCell || nextCell === 'o') return 'crash' | ||
if (nextCell === '.') return 'none' | ||
} | ||
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if (mov === 'L') { | ||
if (prevCellRight === '*') return 'eat' | ||
if (!prevCellRight || prevCellRight === 'o') return 'crash' | ||
if (prevCellRight === '.') return 'none' | ||
} | ||
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if (mov === 'R') { | ||
if (nextCellRight === '*') return 'eat' | ||
if (!nextCellRight || nextCellRight === 'o') return 'crash' | ||
if (nextCellRight === '.') return 'none' | ||
} | ||
break | ||
} | ||
} | ||
} | ||
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return 'none' | ||
} | ||
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console.log(moveTrain(board, 'U')) | ||
// ➞ 'eat' | ||
// Porque el tren se mueve hacia arriba y encuentra una fruta mágica | ||
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console.log(moveTrain(board, 'D')) | ||
// ➞ 'crash' | ||
// El tren se mueve hacia abajo y la cabeza se choca consigo mismo | ||
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console.log(moveTrain(board, 'L')) | ||
// ➞ 'crash' | ||
// El tren se mueve a la izquierda y se choca contra la pared | ||
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console.log(moveTrain(board, 'R')) | ||
// ➞ 'none' | ||
// El tren se mueve hacia derecha y hay un espacio vacío en la derecha |
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{ | ||
"name": "challenge-2024-challenge-09", | ||
"version": "1.0.0", | ||
"description": "Reto #9: 🚂 El tren magico", | ||
"main": "moveTrain.js", | ||
"type": "module", | ||
"scripts": { | ||
"prod": "node moveTrain.js", | ||
"test": "jest" | ||
}, | ||
"keywords": [ | ||
"adventjs", | ||
"challenge", | ||
"desafíos", | ||
"retos", | ||
"JavaScript", | ||
"programación", | ||
"navidad" | ||
], | ||
"author": "John Serrano", | ||
"license": "ISC", | ||
"devDependencies": { | ||
"@babel/core": "7.23.5", | ||
"@babel/preset-env": "7.23.5", | ||
"babel-jest": "29.7.0", | ||
"@types/jest": "29.5.10", | ||
"jest": "29.7.0" | ||
} | ||
} |
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import { moveTrain } from '../moveTrain' | ||
describe('First repeat gift', () => { | ||
test('Should return an array without duplicates', () => { | ||
const board = ['·····', '*····', '@····', 'o····', 'o····'] | ||
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const result = moveTrain(board, 'U') | ||
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expect(result).toBeDefined() | ||
expect(result).toBe('abcde') | ||
}) | ||
}) |