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

describe('lastIndexOf', function() {  it("returns a number indicating an object's last position in a list", function() {    var list = [0, 10, 20, 30, 0, 10, 20, 30, 0, 10];    eq(R.lastIndexOf(30, list), 7);  });  it('returns -1 if the object is not in the list', function() {    var list = [0, 10, 20, 30];    eq(R.lastIndexOf(40, list), -1);  });
  var input = [1, 2, 3, 4, 5, 1];  it('returns the last index of the first item', function() {    eq(R.lastIndexOf(1, input), 5);  });  it('returns the index of the last item', function() {    eq(R.lastIndexOf(5, input), 4);  });
  var list = ['a', 1, 'a'];  list[-2] = 'a'; // Throw a wrench in the gears by assigning a non-valid array index as object property.
  it('finds a', function() {    eq(R.lastIndexOf('a', list), 2);  });  it('does not find c', function() {    eq(R.lastIndexOf('c', list), -1);  });  it('does not consider "1" equal to 1', function() {    eq(R.lastIndexOf('1', list), -1);  });  it('returns -1 for an empty array', function() {    eq(R.lastIndexOf('x', []), -1);  });
  it('has R.equals semantics', function() {    function Just(x) { this.value = x; }    Just.prototype.equals = function(x) {      return x instanceof Just && R.equals(x.value, this.value);    };
    eq(R.lastIndexOf(0, [-0]), -1);    eq(R.lastIndexOf(-0, [0]), -1);    eq(R.lastIndexOf(NaN, [NaN]), 0);    eq(R.lastIndexOf(new Just([42]), [new Just([42])]), 0);  });
  it('dispatches to `lastIndexOf` method', function() {    function Empty() {}    Empty.prototype.lastIndexOf = R.always(-1);
    function List(head, tail) {      this.head = head;      this.tail = tail;    }    List.prototype.lastIndexOf = function(x) {      var idx = this.tail.lastIndexOf(x);      return idx >= 0 ? 1 + idx : this.head === x ? 0 : -1;    };
    var list = new List('b',      new List('a',        new List('n',          new List('a',            new List('n',              new List('a',                new Empty()              )            )          )        )      )    );
    eq(R.lastIndexOf('a', 'banana'), 5);    eq(R.lastIndexOf('x', 'banana'), -1);    eq(R.lastIndexOf('a', list), 5);    eq(R.lastIndexOf('x', list), -1);  });
  it('finds function, compared by identity', function() {    var f = function() {};    var g = function() {};    var list = [g, f, g, f];    eq(R.lastIndexOf(f, list), 3);  });
  it('does not find function, compared by identity', function() {    var f = function() {};    var g = function() {};    var h = function() {};    var list = [g, f];    eq(R.lastIndexOf(h, list), -1);  });
});