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[Rule Request] Prefer reduce(into:_:) over reduce(_:_:) #2658

marcelofabri opened this issue Feb 22, 2019 · 1 comment


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commented Feb 22, 2019

New Issue Checklist

New rule request

  1. Why should this rule be added? Share links to existing discussion about what
    the community thinks about this.

The docs say:

This method is preferred over reduce(::) for efficiency when the result is a copy-on-write type, for example an Array or a Dictionary.

  1. Provide several examples of what would and wouldn't trigger violations.

See #2657 for some examples.

  1. Should the rule be configurable, if so what parameters should be configurable?

Just severity

  1. Should the rule be opt-in or enabled by default? Why?
    See for guidelines on when to mark a rule as opt-in.

Enabled by default if we can avoid false positives


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commented Feb 25, 2019

Enabled by default if we can avoid false positives

I’d love to see a rule like this but I don’t know if I’d enable it by default. If the code isn’t performance critical, there are times when the legibility of the other reduce function makes it worth using it.

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