Help us understand the problem. What is going on with this article?

For Where Violation: `where` clauses are preferred over a single `if` inside a `for`. (for_where) の警告が出た時の処理

for...in...{ if ... == ...} をwhereでスッキリさせる。

for musicItem in musics {
     if musicItem.title == favoriteTitle {
         favoriteList.append(musicItem)
     }
 }

こんな感じで、配列に入った値を一つ一つに分解して、その分解した値のkeyで処理をしたい場合、whereを使えって警告が出る。
その変換

for musicItem in musics where musicItem.title == favoriteTitle {
      favoriteList.append(musicItem)
}

これでOK。
もっとスッキリさせるためには次

for musicItem in (musics.filter { $0.title == favoriteTitle }) {
  favoriteList.append(musicItem)
}

参考:
https://stackoverflow.com/questions/45590544/swiftlint-warning-for-where-violation-where-clauses-are-preferred-over-a-si

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