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Javascript - array question - Basic

Hi

Basic question but just can't get my head round it.

This javascript program details the maximum no of visitors. But there are two months with the same ammount of visitors. How can I get it to output both the months and the number of visitors?

var maximumVisitors; 
var visitorsArray = [88,62,200,100,200,34,123,34,76,199,145,11] ;
var monthNamesArray = ['January','February','March','April','May','June','July','August','September','October','November','December']; 

maximumVisitors = 0;

for (var month = 1; month < visitorsArray.length; month = month + 1) 
{
    if (visitorsArray[month] > visitorsArray[maximumVisitors]) 
    {
        maximumVisitors = month;
    }
}
document.write('Maximum Monthly Visitors of  ' 
                + visitorsArray[maximumVisitors] + ' was in ' 
                + monthNamesArray[maximumVisitors]);

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Gurvinder Pal Singh

make it

var maximumVisitors = new Array();
var visitorsArray = [88,62,200,100,200,34,123,34,76,199,145,11] ;
var monthNamesArray = ['January','February','March','April','May','June','July','August','September','October','November','December'];

maximumVisitors = 0;

for (var month = 1; month < visitorsArray.length; month = month + 1)
{
if (visitorsArray[month] > visitorsArray[maximumVisitors])
{
maximumVisitors[maximumVisitors.length] = month;
}
}
for ( var counter = 0; counter < maximumVisitors.length; counter++)
document.write('Maximum Monthly Visitors of '
+ visitorsArray[maximumVisitors] + ' was in '
+ monthNamesArray[maximumVisitors]);

sjklein42

First time through the loop, keep track of the NUMBER of maximum visitors, not the month.

Second time through the loop, print any month that actually had that number.

var maximumVisitors; 
var visitorsArray = [88,62,200,100,200,34,123,34,76,199,145,11] ;
var monthNamesArray = ['January','February','March','April','May','June','July','August','September','October','November','December']; 

maximumVisitors = 0;

for (var month = 1; month < visitorsArray.length; month = month + 1) 
{
    if (visitorsArray[month] > maximumVisitors) 
    {
        maximumVisitors = visitorsArray[month];
    }
}

for (var month = 1; month < visitorsArray.length; month = month + 1) 
{
    if (visitorsArray[month] == maximumVisitors)
    {
        document.write('Maximum Monthly Visitors of  ' 
                + visitorsArray[month] + ' was in ' 
                + monthNamesArray[month]);
    }
}

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ASKER CERTIFIED SOLUTION

Göran Andersson

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buzzy333

ASKER

Thanks for your help

sjklein42 output produced 'Maximum Monthly Visitors of 200 was in MarchMaximum Monthly Visitors of 200 was in May'

How would I get it it to produce the output as follows: ' Maximum monthly Visitors of 200 was in March & May'

Thanks in advance

sjklein42

This should do it:

var maximumVisitors; 
var visitorsArray = [88,62,200,100,200,34,123,34,76,199,145,11] ;
var monthNamesArray = ['January','February','March','April','May','June','July','August','September','October','November','December']; 

maximumVisitors = 0;

for (var month = 1; month < visitorsArray.length; month = month + 1) 
{
    if (visitorsArray[month] > maximumVisitors) 
    {
        maximumVisitors = visitorsArray[month];
    }
}

var count = 0;
for (var month = 1; month < visitorsArray.length; month = month + 1) 
{
    if (visitorsArray[month] == maximumVisitors)
    {
	if ( ! (count++) )
	{
	        document.write('Maximum Monthly Visitors of  ' 
		        + visitorsArray[month] + ' was in ' 
			+ monthNamesArray[month]);
	}
	else
	{
	        document.write(' & ' + monthNamesArray[month]);
	}
    }
}

Open in new window

Göran Andersson

That change was easily made in the code that I suggested. Simply change the string ", " into " & ":

var visitorsArray = [88,62,200,100,200,34,123,34,76,199,145,11];
var monthNamesArray = ['January','February','March','April','May','June','July','August','September','October','November','December']; 

var max = 0;
for (var i = 1; i < visitorsArray.length; i++) {
  max = Math.max(max, visitorsArray[i]);
}

var months = [];
for (var i = 1; i < visitorsArray.length; i++) {
  if (visitorsArray[i] == max) months.push(monthNamesArray[i]);
}

document.write('Maximum Monthly Visitors of  ' 
                + max + ' was in ' 
                + months.join(' & ');

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buzzy333

ASKER

Hi guys.

for the question posed. I cannot use any other variables and command and should use the following structured code:

For each day
      If the vistors that month equals the maximum
            Write out ‘the greatest monthly visitors was on ‘
       Write out abbreviated name of the month followed by a space
      End if
End for.

Cheers

guys

sjklein42

Do you really mean "For each day" ? I'm guessing you meant "For each month".

This should do it:

var maximumVisitors; 
var visitorsArray = [88,62,200,100,200,34,123,34,76,199,145,11] ;
var monthNamesArray = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec']; 

maximumVisitors = 0;

for (var month = 0; month < visitorsArray.length-1; month++) 
{
    if (visitorsArray[month] > maximumVisitors) 
    {
        maximumVisitors = visitorsArray[month];
    }
}

for (var month = 0; month < visitorsArray.length-1; month++) 
{
    if (visitorsArray[month] == maximumVisitors)
    {
        document.write("the greatest monthly visitors was on '  + monthNamesArray[month] + ' ');
    }
}

Open in new window

Göran Andersson

I cannot use any other variables and command and should use the following structured code

Why? Is this a homework assignment?