Oh boy, how did I not know about Partial until now? This is something all Typescripters need to know.
I'll use the example based on the official ...
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I normally use
Partial<T>
interface when making class constructors.I do the same except with
Object.assign
with partials like so:Works really nicely for creating and updating data.
Rather than having a web of
Object.assign
everywhere you actually see and work with the shape of your data.Your
extend
method just looks likeObject.assign
:)Completely forgot that one exists. Symptom of working too much with an old IE11-supported javascript framework. :P
Nice, I didn't know about
Partial
, nice find, will be useful!Yup it could be used, but take into account that
Object.assign
doesn't merge nested objects.Interesting pattern. I may have to play with it. Thanks!
Yeah
Partial<T>
is great. Another good one isReadonly<T>
. It's a neat way to make things read-only, from a TS perspective even if under the hood (read JS), things are not truly read-only.Here's a TypeScript Playground example for those interested.
For reference, here's the full list of built-in Utilitiy Types. Lots of great stuff in there.
Looking forward to your next post!
It's also interesting to use the Omit<> type, which in most cases is actually a better fit because you can actually say which attibutes are not gonna be present.
Shoutout to Fiona Tran for bringing Partial to my attention.
This a much faster way to type Pick<T,any> :) thanks!
Partial’s are tight!
why not simply use optional parameters ?
Just because something should be optional in a parameter for example doesn't mean it should be optional everywhere, as would happen if you set it optional in the interface
This is great - also the first I'm learning about it!
This partial pattern is completely awesome.. thanks @nick
Watch out...
wow, I didn't know about partial either, thanks for sharing
INCREDIBLE!
Thank you for that!!
Excellent! Just getting into Typescript and little tips like this are immensely helpful.
Thank you 👍