Set data structure in Starlark

[Diego Ortín]

Is there a data structure similar to the Python "set" in Starlark? 

I have the need to ensure no duplicate values exist in a list, and in Python I would usually accomplish this using a set. What would be the best way to do this in Starlark?

Thanks in advance

[Alexandre Rostovtsev]

At the moment, there is no set data type in Starlark. You can use a library (for example, @bazel_skylib//lib:sets.bzl) or do it yourself by representing a set as a dict's keys.

In the long term, a set data type as a language feature probably makes sense; you can propose a Starlark language spec here: https://github.com/bazelbuild/starlark

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[Diego Ortín]

Thank you, I guess I have to consider if adding a dependency on Skylib is worth it over just using the dictionary keys, which sounds a bit hackish. 

I’ve had a look at the process for making design proposals to Starlark, and created the following issue: 

https://github.com/bazelbuild/starlark/issues/264