123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109
var R = require('../source');var eq = require('./shared/eq');

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