> For the complete documentation index, see [llms.txt](https://www.onescript.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.onescript.org/onescript-overview/sets.md).

# Sets

Unlike many other languages, OneScript supports the ability to store, combine and test options that may represent options selected by recipient of a survey. The Set type takes the following basic form:

```csharp
{ident[,ident]}
```

For example:

```csharp
{a,b,c}
```

> Sets do not support whitespace between the ident values.

It is possible to combine sets for example:

```csharp
Set e1 = {a,b,c};
Set e2 = {g,h,i};
e1 = e1 + {d};                // Result is {a,b,c,d}
e1 = e1 - {a};                // Result is {b,c,d}
e1 = e1 + e2;                 // Result is {b,c,g,h,i}
```

It is also possible to test whether a Set is present in a value is:

```csharp
Set e1 = {a,b,c};
Set e2 = e1 & {a};            // Result is {a}
e2 = e1 & {h};                // Result {}
e2 = e1 | {h};                // Result is {a,h}
```

Sets are case insensitive:

```
Set e1 = {A,b,c};
Set e2 = {g,h,i};
e1 = e1 + {D};                // Result is {a,b,c,D}
e1 = e1 - {a};                // Result is {b,c,d}
e1 = e1 + e2;                 // Result is {b,c,g,h,i}
```


---

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