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I have a very simple question. I have Set of Ids which I want to convert to Set of String. I dont want to use for loop to iterate over it. What will be the simplest way to do the same?

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3 Answers 3

up vote 8 down vote accepted

Here's a clever (ugly) one-liner.

Set<Id> ids = new Set<Id>{'001C000001DgWjE','001C000001DgWjD'};

// Here's the one line!
Set<String> idStrs = (Set<String>)JSON.deserialize(JSON.serialize(ids), Set<String>.class);

System.debug('idStrings=' + idStrs);
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I couldn't find a direct one line conversion but below is a way to convert a set of ids to a set of strings without using a for loop. I'm assuming you wanted a one liner but here you go anyway!

Set<Id> setIds = new Set<Id>();

List<Id> setIdList = new List<Id>();

setIdList.addAll(setIds);

String Ids = String.join(setIdList, ',');

Set<String> setIdSet = new Set<String>(Ids.split(','));

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3  
One-liner: Set<String> setIdSet = new Set<String>(String.join(new List<id>(setIds), ',').split(',')) –  sfdcfox Jul 3 at 15:54

I tried a few things:

Set<Id> ids = new Set<Id>();
Set<String> other = (Set<String>)ids;

and

Set<Id> ids = new Set<Id>();
Set<String> other = new Set<String>{ids};

and

Set<Id> ids = new Set<Id>();
Set<String> other = new Set<String>();
other.addAll(ids);

None of those seemed to work and I did a quick google search and don't see anything else that works either. It appears you are stuck with a loop. The only case I can see this being an issue, is if you have a Set<Id> somewhere already and need to add strings to it. Best way to fix this, is to just make the original Set a Set<String>.

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