var expect = require('chai').expect

,d1 = '3 3 9 1 6 5 8 1 5 3', e1 = 5

,d2 = '9 2 9 9 1 8 8 8 2 1 1', e2 = 0

;

// returns an array of unique elements

function uniqueElements(arInput) {

return arInput.filter(testUnique);

}

// returns false is element already in array

// arguments passed in by filter method

function testUnique(e, i, a) {

// v is the element iterated over

// i is the index of the element

// a is the array the filter was called on

// indexOf returns the first index found for a value

// thus if the indexes don't match is must be a duplicate

return a.indexOf(e) === i;

}

// Determines the winner if any

// arPlayers => array of integers

// returns and integer (0 => none; >0 position of winner)

function gameWinner(arPlayers) {

var u = uniqueElements(arPlayers).sort();

var winner = 0, i = 0;

for(; i < u.length; i++) {

if ( arPlayers.indexOf(u[i]) === arPlayers.lastIndexOf(u[i]) ) {

winner = arPlayers.indexOf(u[i]);

break;

}

}

if ( i === (u.length) ) {

return 0;

} else {

return (winner + 1 );

}

}

describe('Challenge', function() {

describe('testUnique()', function() {

it('should be true', function() {

var a = [1,1,1];

expect( testUnique(a[0], 0, a) ).to.be.true;

});

it('should be false', function() {

var a = [1,1,1];

expect( testUnique(a[1], 1, a) ).to.be.false;

});

});

describe('uniqueElements()', function() {

it('should be an array', function() {

var a = [];

expect( uniqueElements(a) ).to.be.a('array');

});

it('should be empty', function() {

var a = [];

expect( uniqueElements(a) ).to.be.empty;

});

it('should be unique', function() {

var a = [1,1];

expect( uniqueElements(a) ).to.eql([1]);

});

});

describe('gameWinner()', function(){

it('should be position 5 because 6 is unique', function() {

var a = [3,3,9,1,6,5,8,1,5,3];

expect( gameWinner(a) ).to.equal(5);

});

it('should be 0 because no unique numbers', function() {

var a = [9,2,9,9,1,8,8,8,2,1];

expect( gameWinner(a) ).to.equal(0);

});

})

});