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Re: Logic problem, i always had problem translate until statements into while

From Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups comp.lang.javascript
Subject Re: Logic problem, i always had problem translate until statements into while
Date 2017-01-26 20:28 +0000
Organization A noiseless patient Spider
Message-ID <87inp11s6w.fsf@bsb.me.uk> (permalink)
References <7112e5ec-cc6f-4b7b-b7db-b83b52bf8fbe@googlegroups.com>

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jonas.thornvall@gmail.com writes:

> do until (regular == true && connected == false )
>
> I honestly feel a bit lost, because i think they are so easy to code
> using do until.

What as the initial values of 'regular' and 'connected'?

> So how should i think about it?

Provided the initial value of the resulting while condition is true you
just need to invert it:

  while (!(regular == true && connected == false)) ...

You can use De Morgan's laws to simplify that if you like:

  !(A && B) <=> !A || !B
  !(A || B) <=> !A && !B

in your case

     !(regular == true && connected == false)
  => !(regular == true) || !(connected == false) 
  => regular != true || connected != false

which I'd just write as

  while (!regular || connected) ...

Often, the use of do ... until is simply an error (while is needed more
often in algorithms than do...until).  In those cases there is no need
for the loop to execute at least once and you don't need to check that
'!regular || connected' is initially true.

-- 
Ben.

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Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-26 10:39 -0800
  Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-26 20:28 +0000
    Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-26 13:24 -0800
      Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-26 13:33 -0800
        Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-26 23:06 +0000
          Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 01:33 -0800
            Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 01:57 -0800
              Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 02:17 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 02:35 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 02:39 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 02:43 -0800
                Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-27 11:23 +0000
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-01-27 12:14 +0000
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 08:00 -0800
                Re: Logic problem, i always had problem translate until statements into while Gene Wirchenko <genew@telus.net> - 2017-01-27 09:29 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 10:43 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 10:44 -0800
                Re: Logic problem, i always had problem translate until statements into while Gene Wirchenko <genew@telus.net> - 2017-01-27 15:46 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:20 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:34 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:51 -0800
                Re: Logic problem, i always had problem translate until statements into while John Harris <niam@jghnorth.org.uk.invalid> - 2017-01-28 10:07 +0000
                Re: Logic problem, i always had problem translate until statements into while Gene Wirchenko <genew@telus.net> - 2017-01-30 09:14 -0800
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-01-28 10:48 +0100
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-28 05:05 -0800
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-01-27 13:43 +0100
                Re: Logic problem, i always had problem translate until statements into while Scott Sauyet <scott.sauyet@gmail.com> - 2017-01-27 19:52 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 22:25 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 22:36 -0800
                Re: Logic problem, i always had problem translate until statements into while Scott Sauyet <scott.sauyet@gmail.com> - 2017-01-29 18:05 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-30 09:25 -0800
                Re: Logic problem, i always had problem translate until statements into while Dr J R Stockton <reply1700@merlyn.demon.co.uk.invalid> - 2017-01-31 23:12 +0000
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-01 09:22 +0100
            Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-27 11:02 +0000
              Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-01-27 12:11 +0000
              Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 07:53 -0800
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-01-27 17:07 +0100
                Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-28 00:55 +0000
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:14 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-27 18:15 -0800
                Re: Logic problem, i always had problem translate until statements into while Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-28 15:22 +0000
                Re: Logic problem, i always had problem translate until statements into while Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-28 16:54 +0100
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-28 13:53 -0800
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-01-28 22:13 +0000
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-29 01:27 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-01-29 09:41 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-02-01 08:51 -0800
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-02-01 09:03 -0800
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-01 19:19 +0100
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-02-01 18:35 +0000
                Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-01 19:40 +0100
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-02-01 19:06 +0000
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-02-01 19:09 +0000
                Re: Logic problem, i always had problem translate until statements into while jonas.thornvall@gmail.com - 2017-02-01 08:51 -0800
                Re: Logic problem, i always had problem translate until statements into while Tim Streater <timstreater@greenbee.net> - 2017-02-01 16:56 +0000
            Re: Logic problem, i always had problem translate until statements into while "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-01-27 13:36 +0100

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