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lambdahands/cta.js

Created December 9, 2014 21:50
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  1. Philip Joseph created this gist Dec 9, 2014.
    73 changes: 73 additions & 0 deletions cta.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,73 @@
    /* @flow */

    var T = require('immutable');

    type Branch = T.List<string>
    type TrainLine = T.Map<string, Branch>
    type CTAMap = T.Map<string, TrainLine>

    /*
    * Representation of Chicago's train stops and branches
    */

    var ctaMap: CTAMap = new T.Map();

    var blueLine: TrainLine = new T.Map().set("O'Hare Branch",
    T.List.of(
    "O'Hare",
    "Rosemont",
    "Cumberland",
    "Harlem",
    "Jefferson Park",
    "Montrose",
    "Irving Park",
    "Addison",
    "Belmont",
    "Logan Square",
    "California",
    "Western",
    "Damen"
    )
    ).set("Milwaulkee-Dearborn Subway",
    T.List.of(
    "Division",
    "Chicago",
    "Grand",
    "Clark / Lake",
    "Washington",
    "Monroe",
    "Jackson",
    "LaSalle",
    "Clinton"
    )
    ).set("Forest Park 'Congress' Branch",
    T.List.of(
    "UIC-Halsted",
    "Racine",
    "Illinois Medical Center",
    "Western",
    "Kedzie-Homan",
    "Pulaski",
    "Cicero",
    "Austin",
    "Oak Park",
    "Harlem",
    "Forest Park"
    )
    );

    ctaMap = ctaMap.set('blue', blueLine);

    // ERROR: call of method count
    // Method cannot be called on optional of Branch
    var numStops: number = blueLine.toSeq().reduce((r, n) => r + n.count(), 0);

    // ERROR: call of method count
    // Method cannot be called on optional of Branch
    var numStopsByBranch = blueLine.map((v, k) => v.count());

    console.log("The CTA Blue Line has " + numStops + " stops.")
    // => The CTA Blue Line has 33 stops.

    console.log(numStopsByBranch);
    // => Map { O'Hare Branch: 13, Milwaulkee-Dearborn Subway: 9, Forest Park 'Congress' Branch: 11 }