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var R = require('../source');var eq = require('./shared/eq');

var albums = [  {title: 'Art of the Fugue', artist: 'Glenn Gould', genre: 'Baroque'},  {title: 'A Farewell to Kings', artist: 'Rush', genre: 'Rock'},  {title: 'Timeout', artist: 'Dave Brubeck Quartet', genre: 'Jazz'},  {title: 'Fly By Night', artist: 'Rush', genre: 'Rock'},  {title: 'Goldberg Variations', artist: 'Daniel Barenboim', genre: 'Baroque'},  {title: 'New World Symphony', artist: 'Leonard Bernstein', genre: 'Romantic'},  {title: 'Romance with the Unseen', artist: 'Don Byron', genre: 'Jazz'},  {title: 'Somewhere In Time', artist: 'Iron Maiden', genre: 'Metal'},  {title: 'In Times of Desparation', artist: 'Danny Holt', genre: 'Modern'},  {title: 'Evita', artist: 'Various', genre: 'Broadway'},  {title: 'Five Leaves Left', artist: 'Nick Drake', genre: 'Folk'},  {title: 'The Magic Flute', artist: 'John Eliot Gardiner', genre: 'Classical'}];var derivedGenre = (function() {  var remap = {    Baroque: 'Classical',    Modern: 'Classical',    Romantic: 'Classical',    Metal: 'Rock'  /*  etc */  };  return function(album) {    var genre = R.prop('genre', album);    return remap[genre] || genre;  };}());

describe('countBy', function() {  it('counts by a simple property of the objects', function() {    eq(R.countBy(R.prop('genre'), albums), {      Baroque: 2, Rock: 2, Jazz: 2, Romantic: 1, Metal: 1, Modern: 1, Broadway: 1, Folk: 1, Classical: 1    });  });
  it('counts by a more complex function on the objects', function() {    eq(R.countBy(derivedGenre, albums), {      Classical: 5, Rock: 3, Jazz: 2, Broadway: 1, Folk: 1    });  });
  it('ignores inherited properties', function() {    var result = R.countBy(R.identity, ['abc', 'toString']);    eq(result.abc, 1);    eq(result.toString, 1);  });
  it('can act as a transducer', function() {    var transducer = R.compose(      R.countBy(R.prop('genre')),      R.map(R.adjust(1, R.toString)));    eq(R.into({}, transducer, albums), {      Baroque: '2', Rock: '2', Jazz: '2', Romantic: '1', Metal: '1', Modern: '1', Broadway: '1', Folk: '1', Classical: '1'    });  });
});