Question

I need a function that should give me a 10th or 100th array, for example

• If i pass 5, it should return 1 to 10
• If i pass 67, it should return 1 to 100
• If i pass 126, it should return 101 to 200
• If i pass 2524, it should return 2001 to 3000

Any guidance?

Answer 1

This gives you what you asked for:

function FunkyRange (TargNum)
{
    var OrderOfMag      = Math.floor (Math.log (TargNum-1) / Math.LN10);

    var NaturalLimLow   = Math.pow (10, OrderOfMag);
    var AdjustedLimLow  = Math.floor ((TargNum-1) / NaturalLimLow) * NaturalLimLow + 1;

    var AdjustedLimHigh = NaturalLimLow + AdjustedLimLow - 1;

    //-- Handle special cases For TargNum <= 10 and <= 100.

    if (AdjustedLimLow  <= 100)
        AdjustedLimLow  = 1;

    if (AdjustedLimHigh <= 10)
    {
        AdjustedLimHigh = 10;
    }
    else
    {
        if (AdjustedLimHigh < 100)
            AdjustedLimHigh = 100;
    }


    return [AdjustedLimLow, AdjustedLimHigh];
}

Which returns:

Input       Lim, Low     Lim, High
-----      ----------   -----------
   5             1           10
  67             1          100
  99             1          100
 100             1          100
 126           101          200
 200           101          200
 299           201          300
 473           401          500
2524          2001         3000