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8 Responses to “Programming Brain Teaser”

1. #1 Sam Hasler says:
   July 10th, 2008 at 4:46 pm

   How did you use the Error console? That would be a useful trick to learn. I tired pasting your code into it and clicking on Evaluate but it didn’t do anything.

2. #2 Giorgio says:
   July 10th, 2008 at 7:12 pm

   @Sam Hasler:
   You need to enter all in one line (unless you store variables in a window object, e.g. using “top.arr”) and end the script with an expression but not an assignment, e.g.:

   var arr = ['a', 'b', 'c', 'c', 'd','e', 'e','e', 'e', 'e', 'f', 'e', 'f', 'e', 'f', 'a', 'a', 'a', 'f', 'f', 'f']; var solution='a b c c d e e <span>e e e</span> f e f e f a a <span>a</span> f f <span>f</span>'; arr.join(' ').replace(/((\w)\s\2\s)((?:\2\s?)+)(?=\s|$)/g, '$1<span>$3</span>') == solution;

   (in one line) will give “true” as its output.

   A portable, concise bookmarklet to quickly test multiline JS is the following:
   javascript:document.body.innerHTML="<textarea onchange='eval(this.value)' cols=80 rows=6/>";void(0)

3. #3 Paul O'Shannessy says:
   July 11th, 2008 at 12:51 am

   I like it. Clever use of regular expressions.

4. #4 Sam Hasler says:
   July 11th, 2008 at 12:59 am

   Thanks

5. #5 john says:
   July 12th, 2008 at 6:12 am

   pls apologize my stupidity.. but what will this expression do?

6. #6 therube says:
   July 15th, 2008 at 6:28 am

   For whatever reason, I am not able to get your bookmarklet to work?
   No matter how I’ve tried it, I end up with an empty box at the top of the screen?

   If I copy/paste into the URL line (prefaced by javascript: ), I correctly get "true".

   I had this bookmarklet (which I picked up somewhere?) that I called ‘Execute HTML’. If I recall, I would use it from time to time to execute HTML snippets. But when I try it on on the script, again I end up with a blank page & no "true".

   
javascript:(function(){var sel;function getText(w){if(w.getSelection){return w.getSelection();}if(w.document.getSelection){return w.document.getSelection();}return w.document.selection.createRange().text;}function getSel(w){try{sel=getText(w);if(sel)return;for(var i=0;F=w.frames[i];i++){getSel(F);if(sel)return;}}catch(e){}}getSel(window);if(!sel)alert('Select some text.');else{w=open();w.document.write(sel);w.document.close();}})()


   Nothing here either, http://www.javascriptwindow.com/ ?

7. #7 Giorgio says:
   July 15th, 2008 at 11:59 am

   @therube:
   My script has no output per se.
   If you want it to show a result, add this line:
   
alert(won);


8. #8 piju says:
   August 6th, 2008 at 12:41 am

   cool,
   i am not a programmer,
   so i dont know what is this,
   but,
   what i see about you is
   you are such a great guy
   u own an IT company,
   u wrote great stuff
   and the most is,
   u are italian!

   ;)

   bytheway,
   i love pizza

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