0

Hi,

I have been creating a round robin. This is similar idea to speed dating except everyone has to talk to everyone.
Whilst I have been able to create this, there is a lot of repetition in my code and I wondering if any of you have recommendations for removing some of that, particularly around the push and pops. The code below I tested within the js.do website.
I will add the output below the code, so you get an idea of what this looks like.
Any help will be appreciated.

<p style="line-height: 18px; font-size: 18px;  font-family: times;">
<br>
Round robbin<br><br>
<script>
    var poslow = [1,2,3,4,5,6];
    var poshigh = [7,8,9,10,11,12];

// this function displays all the positions on the screen aligned
// in two rows one row has 1-6 the opposite row has 7-12
    function calculate()
    {
        for( j=0, k=0; j < poslow.length, k < poshigh.length; j++,k++)
        {       
            document.write('<p style="color:blue;">'+poslow[j]+" "+poshigh[k]+'</p>');

        }

    }


// the first round is the default, this is where everyone starts out
    document.write('<p style="color:red;">'+'round 1 </p>'+"<br/>");
    calculate();

// displays second round
    document.write('<p style="color:red;">'+'round 2 </p>'+"<br/>");

// for the second round the 7 is taken off the begining
// of the second row and added to the beggining of the first.
// the 6 is taken off of the end of the first row and added
// to the end of the second row.

    poshigh.shift();
    poslow.pop();
    poslow.unshift(7);
    poshigh.push(6);
    calculate();

// same principle for the rest of these apart from the numbers change
// according to the round and what is at the end and beginning of the rows

    document.write('<p style="color:red;">'+'round 3 </p>'+"<br/>");

    poshigh.shift();
    poslow.pop();
    poslow.unshift(8);
    poshigh.push(5);
    calculate();

    document.write('<p style="color:red;">'+'round 4 </p>'+"<br/>");

    poshigh.shift();
    poslow.pop();
    poslow.unshift(9);
    poshigh.push(4);
    calculate();


    document.write('<p style="color:red;">'+'round 5 </p>'+"<br/>");

    poshigh.shift();
    poslow.pop();
    poslow.unshift(10);
    poshigh.push(3);
    calculate();


    document.write('<p style="color:red;">'+'round 6 </p>'+"<br/>");

    poshigh.shift();
    poslow.pop();
    poslow.unshift(11);
    poshigh.push(2);
    calculate();

    document.write('<p style="color:red;">'+'round 7 </p>'+"<br/>");

    poshigh.shift();
    poslow.pop();
    poslow.unshift(12);
    poshigh.push(1);
    calculate();

    document.write('<p style="color:red;">'+'round 8 </p>'+"<br/>");

    poshigh.shift();    
    poslow.pop();
    poslow.unshift(6);
    poshigh.push(7);
    calculate();

    document.write('<p style="color:red;">'+'round 9 </p>'+"<br/>");

    poshigh.shift();
    poslow.pop();
    poslow.unshift(5);
    poshigh.push(8);
    calculate();

    document.write('<p style="color:red;">'+'round 10 </p>'+"<br/>");

    poshigh.shift();
    poslow.pop();
    poslow.unshift(4);
    poshigh.push(9);
    calculate();

    document.write('<p style="color:red;">'+'round 11 </p>'+"<br/>");

    poshigh.shift();
    poslow.pop();
    poslow.unshift(3);
    poshigh.push(10);
    calculate();

    document.write('<p style="color:red;">'+'round 12 </p>'+"<br/>");

    poshigh.shift();
    poslow.pop();
    poslow.unshift(2);
    poshigh.push(11);
    calculate();



</script>

Output

round 1

1 7

2 8

3 9

4 10

5 11

6 12

round 2

7 8

1 9

2 10

3 11

4 12

5 6

round 3

8 9

7 10

1 11

2 12

3 6

4 5

round 4

9 10

8 11

7 12

1 6

2 5

3 4

round 5

10 11

9 12

8 6

7 5

1 4

2 3

round 6

11 12

10 6

9 5

8 4

7 3

1 2

round 7

12 6

11 5

10 4

9 3

8 2

7 1

round 8

6 5

12 4

11 3

10 2

9 1

8 7

round 9

5 4

6 3

12 2

11 1

10 7

9 8

round 10

4 3

5 2

6 1

12 7

11 8

10 9

round 11

3 2

4 1

5 7

6 8

12 9

11 10

round 12

2 1

3 7

4 8

5 9

6 10

12 11

Thanks.

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Contributors
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Discussion Span
Last Post by piers
0

I didn't get into the merit about the dating algorithm, but just by condensing your own logic...

    var poslow = [1,2,3,4,5,6];
    var poshigh = [7,8,9,10,11,12];

    // this function displays all the positions on the screen aligned
    // in two rows one row has 1-6 the opposite row has 7-12
    function calculate(round, unshift, push)
    {

        document.write('<p style="color:red;">'+'round ' + round + ' </p>'+"<br/>");

        if ( typeof unshift != 'undefined' ) {
            poshigh.shift();
            poslow.pop();
            poslow.unshift(unshift);
            poshigh.push(push);
        }

        for( j=0, k=0; j < poslow.length, k < poshigh.length; j++,k++)
        {       
            document.write('<p style="color:blue;">'+poslow[j]+" "+poshigh[k]+'</p>');
        }

    }


    // the first round don't pass parameters of unshift so it won't change the indexes
    calculate(1);

    calculate(2, 7, 6);
    calculate(3, 8, 5);
    calculate(4, 9, 4);
    calculate(5, 10, 3);
    calculate(6, 11, 2);
    calculate(7, 12, 1);
    calculate(8, 6, 7);
    calculate(9, 5, 8);
    calculate(9, 4, 9);
    calculate(10, 3, 10);
    calculate(11, 2, 11);


</script>

Edited by AleMonteiro

1

With further evaluation, you could get a little more dynamic...

    var poslow = [1,2,3,4,5,6];
    var poshigh = [7,8,9,10,11,12];


    var popsRounds = [
        [1, undefined, undefined],
        [2, 7, 6],
        [3, 8, 5],
        [4, 9, 4],
        [5, 10, 3],
        [6, 11, 2],
        [7, 12, 1],
        [8, 6, 7],
        [9, 5, 8],
        [9, 4, 9],
        [10, 3, 10],
        [11, 2, 11]
    ];


    // this function displays all the positions on the screen aligned
    // in two rows one row has 1-6 the opposite row has 7-12
    function calculate(round, unshift, push)
    {
        document.write('<p style="color:red;">'+'round ' + round + ' </p>'+"<br/>");
        if ( typeof unshift != 'undefined' ) {
            poshigh.shift();
            poslow.pop();
            poslow.unshift(unshift);
            poshigh.push(push);
        }
        for( j=0, k=0; j < poslow.length, k < poshigh.length; j++,k++)
        {       
            document.write('<p style="color:blue;">'+poslow[j]+" "+poshigh[k]+'</p>');
        }
    }

    for(var i=0,il=popsRounds.length;i<il;i++) {
        var round = popsRounds[i];
        calculate(round[0], round[1], round[2]);

        // Even shorter would be
        // calculate.apply(calculate, popsRounds[i]);
    }
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