DZone Snippets: Singpolyma's Code Snippets

JavaScript var_dump (Mark 2)

singpolyma () — Thu, 12 Jul 2007 15:29:58 GMT

Same as var_dump for PHP, but for JavaScript. Useful if you do not have Firebug.

A typical useage:

document.write(var_dump(ANY-JS-VAR,'html'));



     function var_dump(data,addwhitespace,safety,level) {

        var rtrn = '';

        var dt,it,spaces = '';

        if(!level) {level = 1;}

        for(var i=0; i           spaces += '   ';

        }//end for i        if(typeof(data) != 'object') {

           dt = data;

           if(typeof(data) == 'string') {

              if(addwhitespace == 'html') {

                 dt = dt.replace(/&/g,'&');

                 dt = dt.replace(/>/g,'>');

                 dt = dt.replace(/              }//end if addwhitespace == html

              dt = dt.replace(/\"/g,'\"');

              dt = '"' + dt + '"';

           }//end if typeof == string

           if(typeof(data) == 'function' && addwhitespace) {

              dt = new String(dt).replace(/\n/g,"\n"+spaces);

              if(addwhitespace == 'html') {

                 dt = dt.replace(/&/g,'&');

                 dt = dt.replace(/>/g,'>');

                 dt = dt.replace(/              }//end if addwhitespace == html

           }//end if typeof == function

           if(typeof(data) == 'undefined') {

              dt = 'undefined';

           }//end if typeof == undefined

           if(addwhitespace == 'html') {

              if(typeof(dt) != 'string') {

                 dt = new String(dt);

              }//end typeof != string

              dt = dt.replace(/ /g," ").replace(/\n/g,"
");

           }//end if addwhitespace == html

           return dt;

        }//end if typeof != object && != array

        for (var x in data) {

           if(safety && (level > safety)) {

              dt = '*RECURSION*';

           } else {

              try {

                 dt = var_dump(data[x],addwhitespace,safety,level+1);

              } catch (e) {continue;}

           }//end if-else level > safety

           it = var_dump(x,addwhitespace,safety,level+1);

           rtrn += it + ':' + dt + ',';

           if(addwhitespace) {

              rtrn += '\n'+spaces;

           }//end if addwhitespace

        }//end for...in

        if(addwhitespace) {

           rtrn = '{\n' + spaces + rtrn.substr(0,rtrn.length-(2+(level*3))) + '\n' + spaces.substr(0,spaces.length-3) + '}';

        } else {

           rtrn = '{' + rtrn.substr(0,rtrn.length-1) + '}';

        }//end if-else addwhitespace

        if(addwhitespace == 'html') {

           rtrn = rtrn.replace(/ /g," ").replace(/\n/g,"
");

        }//end if addwhitespace == html

        return rtrn;

     }//end function var_dump

NP Problem Solution

singpolyma () — Thu, 12 Jul 2007 15:17:04 GMT

Taken from hoodwink.d on http://xkcd.com/c287.html



items = ["Mixed Fruit", "French Fries", "Side Salad", "Hot Wings", "Mozzarella Sticks", "Sampler Plate"]

prices = [2.15, 2.75, 3.35, 3.55, 4.20, 5.80]



solution = []

sum = 0

loop do

    break if sum == 15.05

    if sum > 15.05

        solution = []

        sum = 0

        next

    else

        choice = rand prices.length

        sum += prices[choice]

        solution << items[choice]

    end

end



p "A solution is: #{solution.inspect}"

var_dump for javascript

singpolyma () — Wed, 21 Sep 2005 23:31:16 GMT

hackish implementation of the php 'var_dump()' in javascript:



function var_dump(obj) {

   if(typeof obj == "object") {

      return "Type: "+typeof(obj)+((obj.constructor) ? "\nConstructor: "+obj.constructor : "")+"\nValue: " + obj;

   } else {

      return "Type: "+typeof(obj)+"\nValue: "+obj;

   }

}//end function var_dump

Flat-tag updater

singpolyma () — Fri, 08 Jul 2005 01:50:07 GMT

Pass new tags followed by a table name and database handle and this function updates the table so that each tag becomes properly associated/its record created, eg:

table state:
tagname | relatedtags
-----------------------
blog | rss;personal
rss | blog
personal | blog

call (table is named tags):
updateTags("blog personal friends","tags",$db);

table state:
tagname | relatedtags
-----------------------
blog | rss;personal;friends
rss | blog
personal | blog;friends
friends | blog;personal



function updateTags($tags,$table,$db) {//category handling stuff

   include("recordExists.php");//see http://bigbold.com/snippets/posts/show/464

   $cats = explode(";",$tags);//parse tags into array cats

   foreach($cats as $cat) {//loop through cats

      $tmp = array($cat);//dummy array with cat in it

      $tmp = array_diff($cats,$tmp);//get everything in cats that is not cat

      if(!recordExists("tagname",$cat,$table,$db)) {//if there is no category by this name yet

         $tmp = implode(";",$tmp);//make tmp into semicolon-separated string

         $result = mysql_query("INSERT INTO ".$table." (tagname,relatedtags) VALUES ('$cat','$tmp')", $db) or die(mysql_error());//insert category into database

      } else {

         $result = mysql_query("SELECT relatedtags FROM ".$table." WHERE tagname='$cat'", $db) or die(mysql_error());//select already related tags

         $result = mysql_fetch_array($result);//get the result row as an array

         $result = explode(";",$result['relatedtags']);//parse relatedtags into result

         $result = array_merge($tmp,$result);//merge the cats in this $tags (without cat, hence tmp) with the ones that were in there already

         $result = array_unique($result);//strip duplicates

         $result = implode(";",$result);//make result into semicolon-separated string

         $result = mysql_query("UPDATE ".$table." SET relatedtags='$result' WHERE tagname='$cat'", $db) or die(mysql_error());//update category

      }//end if-else !recordExists

   }//end foreach cats

}//end function updateTags

Record Exists

singpolyma () — Fri, 08 Jul 2005 01:27:38 GMT

In mySQL (from PHP), checks for the existance of a record based on id, passing the name of the id field followed by the id to check for, the table name, and the database resource, in that order.



function recordExists($id,$idval,$table,$db) {//check for id=idval in table and return TRUE or FALSE

   $result = mysql_query("SELECT * FROM ".$table." WHERE ".$id."='".$idval."'", $db) or die(mysql_error());

   if($row = mysql_fetch_array($result)) {//if we did return a record

      return 1;

   }//end if row

   return 0;

}//end fuction recordExists