Is there any way to extend the type without creating a new type containing similar properties as given in Typescript interfaces? as an example, I have type like this public type AuditRecord = { fileId: Text; action: Action; userId: Text; timestamp: ?Time.Time; …

You can use type intersection: type AuditOrgdto = AuditRecord and { date : ?Text };

I tried that but I’m getting this error syntax error [M0001], unexpected token 'and', expected one of token or <phrase> sequence: } <typ_args>? ; seplist(<dec_field>,<semicolon>) . <id> -> <typ>

What version of Motoko are you using? This should work since 0.6.12 from last October. Motoko Playground - DFINITY A playground for the Internet Computer's native Motoko language, brought to you by DFINITY

Hm, apparently, SDK 0.8.4 still uses Motoko 0.6.11 by default. You should probably update your SDK to version 0.9. [image] Internet Computer | Documentation Documentation for the internet computer.

I upgrade the SDK. But I’m getting the same error.

It worked. I have to change the version of dfx in dfx.json because I used package vessel package manager. Really thanks for the help @rossberg .

It’s a little strange how I can easily declare a type intersection like this, but I can’t actually construct an object as easily. For example, there’s no support for: { ...auditRecord, date, } like there is in JS… right?

Yes, you are right. There is no spread operator in Motoko. But type intersection worked as expected for me.

posting here believing you guys might be able to help Is there any way to do this? I am having a type public type DishType = { name : Text; dishTypeId : Nat; parentDishTypeId : Nat; description: Text; }; and my data is record {3; record {parentDishTypeId=0; …

It is coming: Field extensions/updates to existing objects by ggreif · Pull Request #3084 · dfinity/motoko · GitHub

Reduce type duplication in Motoko

Developers

ggreif August 26, 2022, 2:12pm 18

In the Motoko Playground you can now take the 0.7.0 version to a test drive: Motoko Playground Update: Actor Classes are now enabled! - #4 by ggreif

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Reduce type duplication in Motoko

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