Find the index of object in array in swift 4

userList is array of objects [User]
userID is identity of object, which is use for find index. 

let userID = "1"

 let tempIndex = userList.index(where: { (user: User) -> Bool in

            user.userID == userID

        })

tempIndex is position of object in userList array. 

You may access the object like bellow
let objUser = userList[tempIndex]

Happy coding! 

Bhavesh Kumbhani

IOS Software Professional 

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