Skip to content

Wishlist: functions with keyword args, optional args, and/or variable-arity argument (varargs) lists #323

Open
@pnkfelix

Description

@pnkfelix

A portion of the community (and of the core team) sees one or more of the following features as important for programmer ergonomics:

  • keyword-based parameters (as opposed to position-based parameters),
  • optional parameters (where one provides a default value for them, usually in the parameter list),
  • variable-arity functions (which can be seen as a generalization or variation on optional parameters, depending on how you look at it).

This issue is recording that we want to investigate designs for this, but not immediately. The main backwards compatibility concern is about premature commitment to library API's that would be simplified if one adds one or more of the above features. Nonetheless, We believe we can produce a reasonable 1.0 version of Rust without support for this.

(This issue is also going to collect links to all of the useful RFC PR's and/or Rust issues that contain community discussion of these features.)

Metadata

Metadata

Assignees

No one assigned

    Labels

    A-expressionsTerm language related proposals & ideasA-syntaxSyntax related proposals & ideasA-typesystemType system related proposals & ideasT-langRelevant to the language team, which will review and decide on the RFC.postponedRFCs that have been postponed and may be revisited at a later time.

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions