> For the complete documentation index, see [llms.txt](https://boxlang.ortusbooks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/set/toset.md). # ToSet Convert a collection into a Set, deduplicating automatically. Accepts an Array, a list-delimited String, an existing Set, a QueryColumn, an XML node, a bounded Range, or any value castable to a Set. When the value is already of the requested variant it is returned as-is; otherwise a new Set of the specified variant is created and populated. ## Method Signature ``` ToSet(value=[any], type=[string], delimiter=[string]) ``` ### Arguments | Argument | Type | Required | Description | Default | | ----------- | -------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- | --------- | | `value` | `any` | `true` | The value to convert. Accepts Array, Set, list-delimited String, QueryColumn, XML, Range, etc. | | | `type` | `string` | `false` |

The backing variant: "default" / "hash" (HashSet), "linked" / "ordered" (LinkedHashSet),
or "sorted" / "tree" (TreeSet). Defaults to "default".

| `default` | | `delimiter` | `string` | `false` | When {@code value} is a String, the list delimiter to split on. Defaults to {@code ","}. | `,` | ## Examples ### Convert an array to a Set Deduplicates the array elements and returns a BoxSet. ```java s = [ 1, 2, 2, 3 ].toSet(); writeOutput( s.size() ); ``` Result: 3 ### Convert to a linked (insertion-ordered) Set ```java s = [ "c", "a", "b", "a" ].toSet( "linked" ); writeOutput( s.toArray().toString() ); ``` Result: \[c, a, b] ### Convert to a sorted Set ```java s = [ 9, 1, 5, 3 ].toSet( "sorted" ); writeOutput( s.toArray().toString() ); ``` Result: \[1, 3, 5, 9] ## Related * [BoxSetAdd](/boxlang-language/reference/built-in-functions/set/boxsetadd.md) * [BoxSetAddAll](/boxlang-language/reference/built-in-functions/set/boxsetaddall.md) * [BoxSetClear](/boxlang-language/reference/built-in-functions/set/boxsetclear.md) * [BoxSetContains](/boxlang-language/reference/built-in-functions/set/boxsetcontains.md) * [BoxSetContainsAll](/boxlang-language/reference/built-in-functions/set/boxsetcontainsall.md) * [BoxSetDifference](/boxlang-language/reference/built-in-functions/set/boxsetdifference.md) * [BoxSetEach](/boxlang-language/reference/built-in-functions/set/boxseteach.md) * [BoxSetEquals](/boxlang-language/reference/built-in-functions/set/boxsetequals.md) * [BoxSetEvery](/boxlang-language/reference/built-in-functions/set/boxsetevery.md) * [BoxSetFilter](/boxlang-language/reference/built-in-functions/set/boxsetfilter.md) * [BoxSetFind](/boxlang-language/reference/built-in-functions/set/boxsetfind.md) * [BoxSetIntersection](/boxlang-language/reference/built-in-functions/set/boxsetintersection.md) * [BoxSetIsDisjointFrom](/boxlang-language/reference/built-in-functions/set/boxsetisdisjointfrom.md) * [BoxSetIsEmpty](/boxlang-language/reference/built-in-functions/set/boxsetisempty.md) * [BoxSetIsSubsetOf](/boxlang-language/reference/built-in-functions/set/boxsetissubsetof.md) * [BoxSetIsSupersetOf](/boxlang-language/reference/built-in-functions/set/boxsetissupersetof.md) * [BoxSetMap](/boxlang-language/reference/built-in-functions/set/boxsetmap.md) * [BoxSetNone](/boxlang-language/reference/built-in-functions/set/boxsetnone.md) * [BoxSetReduce](/boxlang-language/reference/built-in-functions/set/boxsetreduce.md) * [BoxSetReject](/boxlang-language/reference/built-in-functions/set/boxsetreject.md) * [BoxSetRemove](/boxlang-language/reference/built-in-functions/set/boxsetremove.md) * [BoxSetRemoveAll](/boxlang-language/reference/built-in-functions/set/boxsetremoveall.md) * [BoxSetRetainAll](/boxlang-language/reference/built-in-functions/set/boxsetretainall.md) * [BoxSetSome](/boxlang-language/reference/built-in-functions/set/boxsetsome.md) * [BoxSetSymmetricDifference](/boxlang-language/reference/built-in-functions/set/boxsetsymmetricdifference.md) * [BoxSetToArray](/boxlang-language/reference/built-in-functions/set/boxsettoarray.md) * [BoxSetToList](/boxlang-language/reference/built-in-functions/set/boxsettolist.md) * [BoxSetUnion](/boxlang-language/reference/built-in-functions/set/boxsetunion.md) * [ObjectToSet](/boxlang-language/reference/built-in-functions/set/objecttoset.md) * [SetNew](/boxlang-language/reference/built-in-functions/set/setnew.md) * [SetOf](/boxlang-language/reference/built-in-functions/set/setof.md) * [StructKeySet](/boxlang-language/reference/built-in-functions/set/structkeyset.md) * [StructValueSet](/boxlang-language/reference/built-in-functions/set/structvalueset.md) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/set/toset.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.