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Add new cop Style/FloatDivision #7153

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merged 1 commit into from Jun 25, 2019
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@tejasbubane tejasbubane commented Jun 18, 2019

StyleGuide: https://rubystyle.guide/#float-division


Before submitting the PR make sure the following are checked:

  • Wrote good commit messages.
  • Commit message starts with [Fix #issue-number] (if the related issue exists).
  • Feature branch is up-to-date with master (if not - rebase it).
  • Squashed related commits together.
  • Added tests.
  • Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
  • The PR relates to only one subject with a clear title
    and description in grammatically correct, complete sentences.
  • Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.
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@tejasbubane tejasbubane force-pushed the float-division branch 3 times, most recently from 2e9cf2e to c7ba4b0 Jun 19, 2019
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@tejasbubane tejasbubane commented Jun 19, 2019

@bbatsov @koic Added third config option right_coerce and kept left_coerce as default (as per style guide).

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@bbatsov bbatsov commented Jun 22, 2019

After some deliberation I agree with @koic that the best default would be something that just warns if you use to_f on both sides. Let's also update the style guide accordingly.

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@bbatsov bbatsov commented Jun 22, 2019

See also https://blog.rubystyle.guide/ruby/2019/06/21/float-division.html - unfortunately we got no feedback on it.

koic added a commit to koic/ruby-style-guide that referenced this issue Jun 22, 2019
This PR updates a style guide for "Float Division".

The original issue for which this style was proposed.
rubocop#628

It is an update based on the following argument.
rubocop/rubocop#7153 (comment)

The following is a quote from the argument about the reason for this change.

> I wanted to show the following option to make a bad case only when both have `to_f`.
>
> ```ruby
> # bad
> a.to_f / b.to_f
>
> # good
> a.to_f / b
> a / b.to_f
> a.fdiv(b)
> ```
>
> Whether `to_f` is used on the left or right depends on the nature of `a`
> or `b` parameter. On the other hand, it is redundant that `to_f` is used
> in both. At that time, I think it is better to let users choose whether
> to remove the left side `to_f` or the right side `to_f`. This is the
> reason I recommend this option to default.
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@koic koic commented Jun 22, 2019

Thanks for your consideration. I opened a PR rubocop/ruby-style-guide#767 to rubocop-hq/ruby-style-guide repo.

bbatsov added a commit to rubocop/ruby-style-guide that referenced this issue Jun 22, 2019
This PR updates a style guide for "Float Division".

The original issue for which this style was proposed.
#628

It is an update based on the following argument.
rubocop/rubocop#7153 (comment)

The following is a quote from the argument about the reason for this change.

> I wanted to show the following option to make a bad case only when both have `to_f`.
>
> ```ruby
> # bad
> a.to_f / b.to_f
>
> # good
> a.to_f / b
> a / b.to_f
> a.fdiv(b)
> ```
>
> Whether `to_f` is used on the left or right depends on the nature of `a`
> or `b` parameter. On the other hand, it is redundant that `to_f` is used
> in both. At that time, I think it is better to let users choose whether
> to remove the left side `to_f` or the right side `to_f`. This is the
> reason I recommend this option to default.
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@tejasbubane tejasbubane commented Jun 24, 2019

@koic PR updated. Changed default style to single_coerce.

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koic approved these changes Jun 24, 2019
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@koic koic left a comment

This looks good to me. Thank you for the many updates!

@bbatsov bbatsov merged commit 7e5c2b2 into rubocop:master Jun 25, 2019
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@tejasbubane tejasbubane deleted the float-division branch Jun 25, 2019
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4 participants