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

describe('uniqBy', function() {
  it('returns a set from any array based on predicate', function() {    eq(R.uniqBy(Math.abs, [-2, -1, 0, 1, 2]), [-2, -1, 0]);  });
  it('keeps elements from the left', function() {    eq(R.uniqBy(Math.abs, [-1, 2, 4, 3, 1, 3]), [-1, 2, 4, 3]);  });
  it('returns an empty array for an empty array', function() {    eq(R.uniqBy(R.identity, []), []);  });
  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.uniqBy(R.identity, [-0, 0]).length, 2);    eq(R.uniqBy(R.identity, [NaN, NaN]).length, 1);    eq(R.uniqBy(R.identity, [new Just([1, 2, 3]), new Just([1, 2, 3])]).length, 1);  });
});