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

describe('intersection', function() {  var M = [1, 2, 3, 4];  var M2 = [1, 2, 3, 4, 1, 2, 3, 4];  var N = [3, 4, 5, 6];  var N2 = [3, 3, 4, 4, 5, 5, 6, 6];  it('combines two lists into the set of common elements', function() {    eq(R.intersection(M, N), [3, 4]);  });
  it('does not allow duplicates in the output even if the input lists had duplicates', function() {    eq(R.intersection(M2, N2), [3, 4]);  });
  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.intersection([0], [-0]).length, 0);    eq(R.intersection([-0], [0]).length, 0);    eq(R.intersection([NaN], [NaN]).length, 1);    eq(R.intersection([new Just([42])], [new Just([42])]).length, 1);  });
});