Swift：无法转换类型“(Any) throws -> Bool”的值？ 到预期的参数类型 '(Any) throws -> Bool?

Question

I'm trying to take two arrays and combine them into a new array without any duplicates. I can't get around the following error, however.

Cannot convert value of type '(Any) throws -> Bool? to expected argument type '(Any) throws -> Bool?

I'm trying to combine two arrays which contain multiple dictionaries. I'm comparing the "name" in each dictionary in the array.

let array2Name = array2.flatMap({$0["name"]}) // ["eli", "will"]
array2 = array1.reduce(array2) { !array2Name.contains(where: $1["name"] as! (Any) throws -> Bool? ?? "") ? $0 + [$1] : $0 }
print(array2)

Answer 1

You aren't properly comparing the value that is passed into the contains closure. And you can't use the $ variable inside a closure within the closure.

let array2Name = array2.flatMap { $0["name"] }
array2 = array1.reduce(array2, { result, value in
    !array2Name.contains(where: { $0 == value["name"] ?? "" }) ? result + [value]: result
})
print(array2)

---

Edit: This does away with the array2Name value.

array2 = array1.reduce(array2) { result, value in
    result.contains(where: { $0["name"] == value["name"] }) ? result: result + [value]
}