我有一組購買物件 [Purchase] 定義為：
struct Purchase {
let count: Int
let food: String
}
我怎樣才能將這個購買陣列變成具有相同計數（Int）的購買陣列？
例如：
let input: [Purchase(count: 2, food: "popcorn"), Purchase(count: 3, food: "popcorn"), Purchase(count: 2, food: "soda"),
Purchase(count: 2, food: "popcorn"), Purchase(count: 2, food: "soda")]
output: [[Purchase]] = [[Purchase(count: 2, food: "popcorn"), Purchase(count: 2, food: "soda"),
Purchase(count: 2, food: "popcorn"), Purchase(count: 2, food: "soda")], [Purchase(count: 3, food: "soda")]
uj5u.com熱心網友回復：
答案在評論中，但它看起來更干凈一些。
Dictionary(grouping: input, by: \.count).map(\.value)
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