Get object from array by index, that is getting from another array

Question

There are two arrays: idArrayInt and nameArrayString. I need to get an object from first array by index, that I get from second. I know that it is pretty simple, but I'm new at IOS development and don't understand how to implement it.

var idArray = [Int]() //for example 1 2 3
var nameArray = [String]() // for example "one" "two" "three"
var ident: Int!

@IBAction func btnNext_click(_ sender: AnyObject) {

var nameString = lblUnitType.text
var index = nameArray.index(of: nameString) //Cannot invoke 'index' with an argument list of type '(of: String?)' 
ident = idArray[index] //something like that by I don't sure     
}

Sounds like you would be better off using a dictionary than an array — Paulw11
– Paulw11, Commented Nov 24, 2016 at 10:57
or an array of a custom struct, containing just the ID and name — Russell
– Russell, Commented Nov 24, 2016 at 21:43

vadian · Accepted Answer · 2016-11-24 11:05:40Z

2

lblUnitType.text and the result of index(of: are optionals, you need to unwrap them preferable with optional bindings:

if let nameString = lblUnitType.text, let index = nameArray.index(of: nameString), index < idArray.count { 
    ident = idArray[index] 
}

edited Nov 24, 2016 at 11:05

answered Nov 24, 2016 at 10:59

vadian

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1 Comment

vadian Over a year ago

@NiravD Thanks, I added a where clause

itechnician · Accepted Answer · 2016-11-24 11:06:13Z

1

You can learn in this playground as shown.

Also, in your case you can refer dictionaries.

answered Nov 24, 2016 at 11:06

itechnician

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