Re: Drop off an if evaluation?

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From	Arno Welzel <usenet@arnowelzel.de>
Newsgroups	comp.lang.javascript
Subject	Re: Drop off an if evaluation?
Date	Fri, 11 Sep 2020 09:05:05 +0200
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Jonas Thörnvall:

> Is there ways to code so that things that will only be true once, never checked again?
> 
> The check dissapear?

Maybe something like this:

var mycheck = function(x) {
    console.log('Check still executed');
    if(x == true) {
        mycheck = function(x) {
            console.log('Not checking any longer');
            return 1;
        }

        return 1;
    } else {
        return 2;
    }
}

console.log('Run 1 with false');mycheck(false);
console.log('Run 2 with true');mycheck(true);
console.log('Run 3 with false');mycheck(false);
console.log('Run 4 with true');mycheck(true);
console.log('Run 5 with false');mycheck(false);
console.log('Run 6 with true');mycheck(true);

As soon as mycheck() is called with true as parameter, it replaces
itself with another function which will not do any check any more.

-- 
Arno Welzel
https://arnowelzel.de

Thread

Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-10 23:45 -0700
  Re: Drop off an if evaluation? Arno Welzel <usenet@arnowelzel.de> - 2020-09-11 09:05 +0200
  Re: Drop off an if evaluation? Julio Di Egidio <julio@diegidio.name> - 2020-09-11 03:33 -0700
    Re: Drop off an if evaluation? Julio Di Egidio <julio@diegidio.name> - 2020-09-11 07:01 -0700
      Re: Drop off an if evaluation? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2020-09-11 18:20 +0200
    Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-11 10:05 -0700
      Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-11 10:19 -0700
      Re: Drop off an if evaluation? Julio Di Egidio <julio@diegidio.name> - 2020-09-11 11:20 -0700
        Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-11 11:43 -0700
          Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-11 12:18 -0700
            Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-11 14:28 -0700
          Re: Drop off an if evaluation? luserdroog <luser.droog@gmail.com> - 2020-09-12 20:59 -0700
            Re: Drop off an if evaluation? luserdroog <luser.droog@gmail.com> - 2020-09-12 21:49 -0700
              Re: Drop off an if evaluation? luserdroog <luser.droog@gmail.com> - 2020-09-12 23:15 -0700
            Re: Drop off an if evaluation? John G Harris <niam@jghnorth.org.uk.invalid> - 2020-09-13 11:13 +0100
              Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-13 04:00 -0700
                Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-13 04:09 -0700
                Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-13 04:47 -0700
                Re: Drop off an if evaluation? luserdroog <luser.droog@gmail.com> - 2020-09-13 22:56 -0700
                Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-14 08:22 -0700
                Re: Drop off an if evaluation? luserdroog <luser.droog@gmail.com> - 2020-09-14 10:55 -0700
                Re: Drop off an if evaluation? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-09-14 14:47 -0700

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