Discussion on: Finally, an easy way to use TypeScript enums

[Cubicle Buddha]

Update: You're right. That object approach also has exhaustiveness checking. I'm glad I learned something! I will say that the ts-enum-util library has many more features than what I mentioned.

Here's my original reply for posterity. Note: I was super duper wrong.

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You lose the exhaustiveness checking. This code compiles and it shouldn't:

enum FoodPreference {
    vegan = 'vegan',
    vegetarian = 'vegetarian',
    omnivore = 'omnivore'
    somethingNew = 'this is the new thing that is not going to get caught'
}

const foodPreferenceQuestion : {[preference in FoodPreference] : string } = {
    [FoodPreference.vegan] : 'Do you like nuts?',
    [FoodPreference.vegetarian] : "You're really a pescatarian aren't you?",
    [FoodPreference.omnivore] : 'You are the most picky omnivore in the history of ever I bet'
};

function getFoodPreferenceQuestion(preference : FoodPreference) {
    return foodPreferenceQuestion[preference];
}

// Woops, I get undefined;
const iHopeThisIsDefined = getFoodPreference(FoodPreference.somethingNew);

If you use the library, the code will throw a compiler error saying that you forgot to handle the new case.

[Cubicle Buddha]

I updated my comment reply because the object approach does work. Although the library does have some other really cool features like easy ways to iterate over the enum.

[Sophie The Lionhart]

That could be useful, though I haven't really needed enums in recent times so maybe there is something for that as well?

Either way, glad you learned something new! :D

To be fair, I had to look it up a bit as I've only used enums a handful of times on my TS projects so far so I was unfamiliar but I was pretty sure that this was an existing feature. Basically what I'm trying to say is that I too learned this. :P

[Cubicle Buddha]

Yea I recently had to iterate over an enum for a React project and its basically a giant headache. So when you need to do it it’s nice to have a library to reduce the headache haha.