Support procedural for loops

[liangyuanpeng]

Feature Request

Is your feature request related to a problem? Please describe:

Describe the feature you'd like:

I'm using kcl to generate configuration with docker-compose for etcd cluster, i want to set a param of cluster node count and then generate a cluster, and the kcl configuration like this:

for _i:=1;i<5;i++{
        _composeService+={...}
}

This is very helpful for quickly generating a docker-compose file for a stateful service cluster! and seems like it's not support now: https://www.kcl-lang.io/docs/next/user_docs/support/faq-kcl#46-procedural-for-loop

The case2 is dynamically generate kind cluster configuration files for multiple kind nodes. #1410

you can see that now i just use if count==3 / count ==5 for it (:

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

[Peefy]

In the current version:

• For stateless loops, we can use the for derivation and lambda function to implement it, such as https://www.kcl-lang.io/docs/next/user_docs/support/faq-kcl#46-procedural-for-loop or _composeService = [{# omit the svc config} for i in range(5)]
• For stateful loops, we can use function recursion to simulate procedural for loops, such as: https://github.com/kcl-lang/modules/blob/main/difflib/main.k#L82

If you encounter specific code implementation issues, I can provide a more detailed sample code.

[liangyuanpeng]

Thanks for quickly reply and i will try the range on tomorrow, seems like it's what i want!

[liangyuanpeng]

closing.. range is working for me.