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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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Xref: csiph.com comp.lang.javascript:38772

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