Feature #10549: Deprecate each_with_index and each_with_object in favor of with_index and with_object

• Status: Assigned
• Assignee: matz (Yukihiro Matsumoto)
• Target version: -

[danielmorrison (Daniel Morrison)]

I wonder if we can deprecate each_with_index and each_with_object and fully recommend with_index and with_object instead.

I personally like the shorter forms because they hint that they can be used with more methods than simply each. People don't need to ask if there's a map_with_index method, they can just try chaining it the same way and it works! I realized this when teaching new Rubyists, because they often ask those questions.

There is a negligible performance hit.

Lots of code uses each_with_index but it is a one-character change to use each.with_index instead.

Forgive me if this has been brought up recently, but I couldn't find any discussion on it.

[trans (Thomas Sawyer)]

If Functors* (https://bugs.ruby-lang.org/issues/6594) could be built into the language proper, then what you suggest should be possible with essentially no performance penalties at all.

(* Not to be confused with the Haskell concept.)

[naruse (Yui NARUSE)]

• Target version deleted (2.2.0)

[hsbt (Hiroshi SHIBATA)]

• Tracker changed from Misc to Feature

[hsbt (Hiroshi SHIBATA)]

• Status changed from Open to Assigned