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(a == 1 && a == 2 && a == 3) === true - Wait, hold on...

EmNudge on November 26, 2019

Some of you may recognize the problem in the title. It's a bit of a famous sample of wtfJS, explained very well by Brandon Morelli in 2018. The co...
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notwearingpants profile image
NotWearingPants •

There is no reason to use an IIFE, certainly not one that returns anything.
Since we are using a block scoped variable we can just wrap it in curly braces:

{
    let value = 0;
    Object.defineProperty(window, 'a', {
        get() {
            value++;
            console.log("value incremented!");
            return value;
        }
    });
}

if (a === 1 && a === 2 && a === 3) {
    console.log("We got it!");
}
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emnudge profile image
EmNudge •

Yes, that's true!
I was thinking more along the lines of having the scope reside entirely within Object.defineProperty where I don't believe a block scope would actually work, which is why I used an IIFE.
But this is completely valid, too!

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emnudge profile image
EmNudge •

Haha, that would have been some real weirdness. It still works, but you need some code before it.

I do have a different article, the one on wtfjs and coercion, that is just copy/paste though!