swift add element in a array of dictionary nested in a dictionary

Question

I have the following code :

var TabActions: Dictionary<String, Array<Dictionary<String, String>>> = [:]

TabActions = ["EVENT1" : ["TARGET1" : "ACTION1"], ["TARGET2" : "ACTION2"]]

I want to add ["TARGET3" : "ACTION3"] to the list but I can't figure how to do this. I've tried :

TabActions["EVENT1"] = [["TARGET3" : "ACTION3"]]

but it replaces the value instead of adding it and all other attempts end up with an error

What would be the best syntax to do this ?

TabActions should be tabActions - instances lower case - Classes/Struc Definition upper case — muescha
– muescha, Commented Jun 22, 2017 at 21:57

Sergio G · Accepted Answer · 2015-01-25 14:32:02Z

2

If you do really need a dictionary of arrays of dictionaries as presented, then Antonio's answer is correct, append will do the job:

var TabActions: Dictionary<String, Array<Dictionary<String, String>>> = [:]
TabActions = ["EVENT1" : [["TARGET1" : "ACTION1"], ["TARGET2" : "ACTION2"]]]

TabActions["EVENT1"]?.append(["TARGET3" : "ACTION3"])

On the other hand if you can get by with a simpler dictionary of dictionaries you just need to do:

var TabActions: Dictionary<String, Dictionary<String, String>> = [:]       
TabActions = ["EVENT1" : ["TARGET1" : "ACTION1", "TARGET2" : "ACTION2"]]

TabActions["EVENT1"]?["TARGET3"] = "ACTION3"

answered Jan 25, 2015 at 14:32

Sergio G

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2 Comments

Jonah Begood Over a year ago

Thanks. In your second proposition (without the Array) how to do if the first key (EVENT1) does not exist if I want the creation of both the key and the nested dictionary elements ("TARGET3", "ACTION3") associated to this key ?

Sergio G Over a year ago

Good point, you need to check if there is an existing dictionary for a given key:

if let targets = TabActions["EVENT2"] {             TabActions["EVENT2"]?["TARGET3"] = "ACTION3"         } else {             TabActions["EVENT2"] = ["TARGET3" : "ACTION3" ]         }

Antonio · Accepted Answer · 2015-01-25 14:17:48Z

0

The TabActions dictionary contains array values - and to append to an array you use the append method:

TabActions["EVENT1"]?.append(["TARGET3": "ACTION3"])

Note that if the EVENT1 key is not found, no addition takes place.

answered Jan 25, 2015 at 14:17

Antonio

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1 Comment

Jonah Begood Over a year ago

Thanks for this quick answer ! What would I do in the case the first key does not exist as the append won't do anything as you said ?

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