Learning Typescript is often a rediscovery journey. Your initial impression can be pretty deceptive: isn't it just a way of annotating Javascript, ...
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Types have a higher performance impact compared to interfaces so in larger codebases prioritizing interfaces over types should be considered.
Good point. I've never measured the compiler's performance for using interface vs. type. I see people saying interface inheritance is easier to type-check than type interception, which sounds reasonable.
I think if there's quite a lot of inheritance in the code base, it makes good sense to prefer interfaces that look more object-oriented.
I'll do some more research and maybe update the post later. Thank you!
Are you sure that's true? I recently heard that that's actually a myth.
If I understand github.com/microsoft/TypeScript/wi... correctly, types aren't universally slower, but once you start doing more complex type unions and intersections, it can be faster to use interfaces.
That's my understanding too.
I believe it's mainly due to this statement: "A final noteworthy difference is that when checking against a target intersection type, every constituent is checked before checking against the "effective"/"flattened" type." Though it feels like a limitation of the current tsc implementation, I don't see why checking of type intersection has to be done repeatedly instead of cached.
Would love to see some benchmarks.
Incredible article 👏
It will be very cool if you write something similar for other languages.
Thank you @mariamarsh ! I'll see what to learn for the new year :D.
I'm not all the way thru, but this a 5 star article. Most important thing I've learned from it so far is that I don't know TS well enough. Thanks for the great info ... that revelation will have me following you and looking for more great articles.
Thank you for the recognition, @mikec711g . It's a great pleasure!
TS is fantastic. I've been using languages created by Anders Hejlsberg in my career, and they're just consistently awesome! True genius.
I'll strive to create content that matters.
this is a great post, author has very good understanding on TS
dev.to needs more articles like that.
Thank you.
Dear ZenStack，may I translate your article into Chinese?I would like to share it with more developers in China. I will give the original author and original source.
Hey @qq449245884 , I'm glad you find it helpful. Please feel free to translate and share. Thanks!
I really appreciate the time you took to make this article. Thank you!
Thank you so much 🥰🥰💕🥰🥰
Thanks for the article.
Very small typo in #9:
NamedCircle's name property should not be optional.
Thanks, @guillaumelagrange . The "name" field is intentionally optional to demonstrate the effect of the
satisfieskeyword. TheNamedCircletype gives a "looser" contract than inferred by the variable declaration.Does it make sense, or maybe I missed something?
It's great tips, thanks
Great article! I found the tips really helpful in improving my Typescript skills :)
it's always nice to find resources that are easy to understand and practical to use.
Thank you for sharing!
Many thanks, improved my typescript skill in few lines :-)
Glad to help 😄. Thank you for your interest!
This is an amazing article, I was skeptical about picking up on anything I didn't know yet and pleasantly surprised with a few major points. Thank you for taking the time to write this.
very helpful, thanks mate. also exploring ZenStack.
This is obviously a nitpick, but "number" actually represents a finite set of values.
You're right ... integers are bounded, and floats have finite precisions. I'll make an update.
Great, I will bookmark for later
Very good article, but:
Not an "intersection" actually but "union".
Thanks for the comment @ostgals . The reason why it's an intersection is because the resulting type requires both a "radius" and a "color" field, so it's a smaller set than type Measure and type Style. Does this make sense?
Very helpful, thanks!
I learned many new things here. The author's knowledge on typescript looks very good. I used to struggle with optional fields now I know "satisfies" will help in some of those situation.
Thanks for the compliment @msnisha . Typescript is an extraordinary language, and there's some special fun in learning it 😄.