How to fetch data from a dictionary - arrays

Question

I have a list of dogs and need to fetch certain bits of data. In one case I need the row of names to show in a list, in other cases I need all or parts of the data from a single dog (name, gender, speed). I am fairly certain I should be using an array, although I started with a dictionary. I plan to add more parameters and allow users to add more dogs, so I am trying to find the most expandable option
struct Dog {
var name: String
var gender: String
var speed: Int
}
struct MyDogs {
let myDogs = [
Dog(name: "Saleks", gender: "Male", speed: 50),
Dog(name: "Balto", gender: "Male", speed: 70),
Dog(name: "Mila", gender: "Female", speed: 20)
]
}

Answer 1

WARNING I don't have my IDE available, may have a few syntax errors.
For reference, what you're demonstrating is not a multi-dimensional array. A 3d array is like this.
let some3DArray =
[["Hello", "World"],
["This", "Is", "An"],
["Multidimensional","Array"]]
To access the values in your example, based on what you're asking for you'd do it like so.
//To loop through all the dogs in your array. Useful for your "List"
for dog in yourDogs {
print(" Name: \(dog.name) "
}
// To find a dog based on some property you can do something like this.
let dog = {
for dog in yourDogs {
if dog.name == yourSearchValue {
return dog
} else {
//HANDLE NULL VALUE
//What do you want to happen if NO dog is found?
}
return null
}
}
// You can use the values from the array by accessing it directly via an index.
// This can be done with whatever conditional you need to specifically reach.
let specificDog = dogs[3]
// Once you have your copy of the specific dog you want to access.
// You can then get the values of that object.
let dogName = specificDog .name
let dogGender = specificDog .gender
let dogSpeed = specificDog .speed
Your use-case seems to be on the right track. An array would be useful and provide the most flexibility to add more dogs later down the road. This could be handled very easily for example by doing something like this. You can find out more about that here. Add an element to an array in Swift
var yourDogArray = [Dogs]()
yourDogArray.append(Dog(name: "xxx", gender: "female", speed: 20))
TableView(didSelectRowAt...)
This is a common usage And it works because your list that you populate is populated on an index from 0 to length which means if you select the first item on the list, it will match with your first item in your arrayCollection.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath {
let name = yourDogArray[indexPath.row].name
let gender = yourDogArray[indexPath.row].gender
let speed = yourDogArray[indexPath.row].speed
//Do whatever else you need to do here with your data. In your case you'd
//probably segue to the details view controller and present this data.
//Read up on Segue and Prepare for Segue to pass data between controllers.
}