[SR-5742] Refactoring action to convert imperative code to functional style

Description

func foo(list : [String]) {
  var result = [String]()

  for element in list {
    if !element.isEmpty {
      result.append(element)
    }
  }
}

func foo(list : [String]) {
  var result = list.filter { !$0.isEmpty }
}

Contributor guide

Tech stack

swift

Domain

tooling

Issue type

feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-2 days

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

mostly clear

Prerequisites

Basic knowledge of SwiftUnderstanding of functional programming concepts

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

70

Research direction

This issue requests a new refactoring action to convert imperative for loops with conditional appends to the filter method. The implementation would involve adding a new refactoring provider in the Swift source tooling. Start by examining existing refactoring implementations in the repository, such as Refactoring.cpp or SwiftRefactoring.cpp, to understand the pattern for adding new actions. Also, look at the test cases for refactorings to see how they are structured. The contributor should identify where to insert the new refactoring logic and ensure it integrates with the SourceKit framework.