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@roehrt/9-for-90
@roehrt/9-for-90/src/index.js

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Readme

9 € Ticket 9️⃣🎫🚂

Background

From June on Germany offers a “9 for 90” ticket, which is primarily intended to inspire more people to use public transport and offers free use of public transport for 90 days for 9 € monthly (so 27 € for all 90 days). However, while it's primarily intended for regional transport, it can also be useful for long-distance travels. In fact: you can strip of all regional traffic at the beginning and ending of the journey.

How it works

At the moment the "algorithm" is quite simple: just strip off the beginning and ending of the journey and check if this journey is cheaper - a smarter algorithm (using some kind of gathered graphs) is planned. All the heavy-lifting is done by the great hafas-client.

Installation

[WIP]

API example

const { findJourneys } = require('@roehrt/9-for-90');
findJourneys('8011160', '8010224').then((data) => {
  console.log(require('util').inspect(data, {depth: null, colors: true}))
});

More information on how to use findJourneys can be found in the hafas-client docs: journeys and findJourneys have the same signature and nearly the same return type and can therefore be used interchangeably. It returns an array of Journeys an earlierRef and laterRef can't be used. The only additional property that findJourneys return is an optional object trick storing how the price saving was achieved.

interface CheaperJourney extends Journey {
  trick?: {
    prepend: Leg[],
    append: Leg[],
    oldPrice: number,
  }
}

oldPrice stores the unoptimized price.
prepend stores all legs that need to be prepended to the original journey (regional trains).
append stores all legs that need to be appended to the original journey (regional trains).

Note: it's the same API used in baahn.

Downsides

In case of delay of the regional traffic, one has then no right to compensation.

baahn - JavaScript client for finding special cheaper connections for Deutsche Bahn journeys.

@roehrt/9-for-90