Technically Thinking

Initializing an array:
The following code will create the months array. number_of_months will contain the length of the array (12).

number_of_months = split("Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec", months, ",");

Setting an array value using the key:
Array indexing in AWK starts at 1:

months[1] = "Jan";

Testing the existence of an array key:

if(2 in months)
{
  printf("The 2nd Month: %s\n", months[2]);
}

Iterating through an Array

Iterating through an array can be done using the key. The key can then be used to access the values inside the array
Note: Using this method, the order of the keys in the loop is arbitrary:
for(key in months)
{
  printf("Index %d: %s\n", key, months[key]);
}

Iteration can also be done using the incremental index method:
for (i=1; i<=number_of_months; i++)
{
  printf("Index %d: %s\n", i, months[i]);
}

Associative Arrays:

together["pees"] = "carrots";
together["gin"] = "tonic";

Deleting array elements and arrays:

delete months[12]; # Removes that element of the array
delete months; # Deletes the array itself

nicely done. thanks for posting.