Refer to Array Index by Value

I have an the following data in SwiftUI.

struct Exercise: Identifiable {
    var id = UUID()
    var name: String
    var muscleGroup: [MuscleGroup]
    var equipment: [Equipment]
}

let exercises = [
    Exercise(name: "Ab Wheel", muscleGroup: [muscleGroups[0], muscleGroups[1]], equipment: [equipments[0], equipments[2]])
]

I want to refer to the muscleGroup and equipment values by name rather than index as that is easier for me. I have found solutions, however they only return the first value, rather than all values.

How can I refer to the index by value where it also returns all index items rather than only the first?

The solution I found was through a helper function, but this only returns the first value:

func getEquipment(names: [String]) -> [Equipment] {
    return equipments.filter { equipment in
        names.contains(equipment.name)
    }
}

When I implement that solution as such:

let exercises = [
    Exercise(name: "Ab Wheel", muscleGroup: [muscleGroups[0], muscleGroups[1]], equipment: getEquipment(names: ["Barbell", "Dumbbell"]))
]

I get the following result. I want both Barbell and Dumbell to appear:

It isn't completely clear what you are trying to do. I gather you want to have a type that is easy to read and lets you list values.

I suggest enums:

enum MuscleGroup {
    case lats
    case glutes
    case abs
    case pecs
}

If you need to treat it as an integer so you can use it to index into arrays, make its base type Int:

enum MuscleGroup: Int {
    case lats
    case glutes
    case abs
    case pecs
}

You can then get a string description of any given MuscleGroup as well as a zero-based integer value using rawValue:

let aMuscleGroup = MuscleGroup.lats
print(String("aMuscleGroup = '\(String(describing: aMuscleGroup))'"))
print ("aMuscleGroup int value = \(aMuscleGroup.rawValue)")

That will log

aMuscleGroup = 'lats'
aMuscleGroup int value = 0

And you can use the rawValue to index into arrays. Say you have an array of exercises indexed by the muscle groups they work:

let latExercises = exercises[MuscleGroup.lats.rawValue]

Or your Exercise type:

struct Exercise: Identifiable {
    var id = UUID()
    var name: String
    var muscleGroup: [MuscleGroup]
    var equipment: [Equipment]
}

let exercises = [
    Exercise(name: "Ab Wheel", muscleGroup: [.lats, .pecs], equipment: [equipments[0], equipments[2]])
]

(And it would make sense to use enums for your equipment type as well. I leave that as an exercise for you.)