On 12/27/2012 1:29 PM, Matijn Woudt wrote:
On Thu, Dec 27, 2012 at 4:42 PM, Tedd Sperling <tedd@xxxxxxxxxxxx> wrote:
On Dec 26, 2012, at 10:09 AM, Jim Giner <jim.giner@xxxxxxxxxxxxxxxxxx>
wrote:
While I fully understand the purpose of the do...while construct, I just
never get used to seeing it used. (in other langs I had to deal with a
'repeat...until construct and dis-liked that also). I pretty much know if
I'm going to have to deal with a "run at least once" when I'm coding and
therefore code appropriately, altho I don't know in what ways I've handled
it at this very moment.
-snip-
To me - so much easier to comprehend at first glance. As soon as my eye
comes to a block of code starting with a conditional like 'while', I
readily see what makes it tick. Again I see the potential usefulness of
doing it the other way as you did in your example, but in your case there
wasn't a need for using 'do...while' since you structured it so that there
was never a case where you had to force the loop to happen regardless of
conditions.
I too used while's instead of do's for the same reason.
However, in my class I had a student show be the light (one can always
learn from beginners).
Think of it this way, you travel into the code knowing that at some point
you're going to repeat the block of code IF a condition is going to be met
within the block of code. With that consideration, the 'do/while()' works.
Using just a 'while()' for everything means you must determine the what
the truth of the 'while()' is going to be AND set that value before the
loop. Whereas, using a 'do/while()', you don't need to set the truth until
the block of code has been implemented AND at that point determine the
truth of the block of code.
Cheers,
tedd
There are just cases where do/while makes more sense, for example:
do {
$c = fgetc($fp);
} while ($c != 0);
if you want to put while in front, you need to duplicate the fgetc call,
like this:
$c = fgetc($fp);
while($c != 0) {
$c = fgetc($fp);
}
Which is worse than the do/while construct.
- Matijn
I never said it wasn't useful, just not something I have ever HAD to do.
I don't often speak in 4 syllable words either, but once in a while I
find the need.... :)
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