Function calculation of month

Question

I have a function that identifies the month through two entries, the initial month and also the difference that would be the maximum range of my array. At the same time there is another condition that in the case, limits my list to 6 values

var CountMes = 0;
function DataTabela(mesInicial, Diferenca) {
    var Meses = [];
    Meses.push(mesInicial);
    while (CountMes < 5 && Diferenca > CountMes) {
        CountMes++;
        mesInicial++;
        Meses.push(mesInicial);
    }
    alert(Meses.toString());
}

It works perfectly while we’re in the same year. My problem is, if my initial month entry is 11 (November) and my difference is 4, my list should have: November, December, January and February. However, as the account is on 12 basis and January would be equivalent to mesInicial = 1, how can I model my function to be adaptable to year transitions?

Answer 1

var CountMes = 0;
function DataTabela(mesInicial, Diferenca) {
    var Meses = [];
    Meses.push(mesInicial);
    while (CountMes < 5 && Diferenca > CountMes) {
        CountMes++;
        mesInicial++;
        //////
        if ( mesInicial > 12 ) mesInicial = 1;
        //////
        Meses.push(mesInicial);
    }
    alert(Meses.toString());
}

I could think of another more compact logic:

function DataTabela( mesInicial, Diferenca ) {
   var Meses = [];
   for ( i = 0; i < 5 && i < Diferenca; i++ ) {
      Meses.push( ( ( mesInicial + i - 1 ) % 12 ) + 1 );
   }
   alert(Meses.toString());
}

Note: the % is module operator (or "rest").