Swift : Query Dictionary using value

Question

I have a dictionary but I need to query by particular value to get the key. But it seems like swift doesn't have valueforKey function.

Example:

print(myDictionary["key"])
//output: 100

//but I want to get:
print(myDictionary.valueForkey:"100")
//output: key

Any of you knows how can I do this in swift?

Your code implies `keyForValue`... ;-) – vadian Mar 01 '17 at 19:26 — vadian, Mar 01 '17 at 19:26

vadian · Accepted Answer · 2017-03-01T19:45:11.357

3

Of course you can do that in Swift because dictionaries can be represented by tuples:

let myDictionary = ["foo": 100, "baz" : 200]

if let found = myDictionary.filter({ $0.1 == 100 }).first {
    let key = found.0
    print(key) // "foo"
}

edited Mar 01 '17 at 19:45

answered Mar 01 '17 at 19:37

vadian

274,689
30
353
361

this works. I like swift but I think Objective-C is more cleaner in my opinion. – user2924482 Mar 01 '17 at 19:48
There are some more sophisticated (and generic) solutions in the duplicate question. – vadian Mar 01 '17 at 19:54

Swift : Query Dictionary using value

1 Answers1