Javascript print SQL first item in ResultSet without comma, then all others with comma

create procedure my_stored_procedure(TABLE VARCHAR)
  returns varchar
  language javascript
  as
    $$

var sql_col_list = `select distinct key_name from TABLE;`
results = snowflake.execute({sqlText: sql_col_list});

while (results.next())
{
     script += ',' + results.getColumnValue(1) + 'n';
}

Current output:

, column1
, column2
, column3

Desired output:

  column1
, column2
, column2

How can I do this in javascript within the sql stored procedure? I would like to not have to execute the query more than once because the actual query is computationally intensive.

Answer

you can add boolean check if this first or not:

var sql_col_list = `select distinct key_name from TABLE;`
results = snowflake.execute({sqlText: sql_col_list});

var isFirst = true;

while (results.next())
{
      if(isFirst)
      {
        script += results.getColumnValue(1) + 'n';
        isFirst = false;
        continue;
      }
     script += ',' + results.getColumnValue(1) + 'n';
}