// Here's the explanation of the challenge -- when you're done reading it,
// click on `main.js` above to get started with the challenge!
// Getting around in a big city is no easy task! With so many options to get
// from point A to point B, it's easy to get confused. Fortunately, we can use
// code to figure out the best way to travel.
// ## Description
// In this challenge, you will write a `shortestTrip` function that receives a
// map (object) as an argument. Each key in the map is the name of a mode of
// transit between two places, and its value is an array containing the
// departure and arrival times for that mode of transit, represented as
// strings. The map represents the different modes of transit available
// between two points in a city.
// For example, if the trip can be done by taking the train, a bus, or
// walking, your function could be invoked like:
// shortestTrip({
// bus: ["09:15", "09:36"],
// train: ["09:30", "09:42"],
// walk: ["09:02", "09:40"]
// })
// Your function should return the name of the transit method in which the
// trip takes **the least time to complete** -- _not_ the transit method that
// arrives earlier, but the one in which you spend the least time travelling.
// The list of modes of transit will always contain at least one mode, and
//t he time will always be represented in the `hh:mm` format, using two
// digits for the hours and for the minutes.
// The times will never represent starting and ending on different days,
// meaning the travel times will never cross midnight. The departure time will
// always be earlier than the arrival time. No two trips will take the same
// amount of time.
/* Check out README.md for instructions! */
function shortestTrip(modes) {
/* Your code goes here! */
/* Press [▶ Run] to see your code in action! */
/* You'll see the output of the tests below the button */
}
/* Test runner (do not modify this line!) */
const expect = require("./expect")(shortestTrip)
/* Test cases (remember to add more!) */
// i walk a lonely road...
expect("walk", {
"walk": ["09:10", "10:47"]
})
// picks the shortest travel time
expect("bus", {
"walk": ["08:13", "08:53"],
"bus": ["08:45", "09:02"]
})
// your test case here!
// expect(expectedMode, modes)
/* Test runner (do not modify this!) */
module.exports = (run) => function expect(expected, ...inputs) {
const stringify = (value) => {
const serialised = JSON.stringify(value, undefined, 2)
|| "undefined"
const lines = serialised.split('\n')
for (i = 1; i < lines.length; i++) {
lines[i] = "\t" + lines[i]
}
return lines.join('\n')
}
const serialisedInputs = inputs
.map(stringify)
.join(", ")
const actual = run(...inputs)
if (expected !== actual) {
console.log(
` ❌ ${run.name}(${serialisedInputs})\n\n` +
`\texpected: ${stringify(expected)}\n` +
`\tbut instead got: ${stringify(actual)}\n\n`
)
} else {
console.log(
` ✅ ${run.name}(${serialisedInputs}) === ${stringify(actual)}\n`
)
}
}
