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18a519f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | using System.Collections;
using System.Linq;
namespace Unity.VisualScripting
{
/// <summary>
/// Returns the first item in a collection or enumeration.
/// </summary>
[UnitCategory("Collections")]
public sealed class FirstItem : Unit
{
/// <summary>
/// The collection.
/// </summary>
[DoNotSerialize]
[PortLabelHidden]
public ValueInput collection { get; private set; }
/// <summary>
/// The first item of the collection.
/// </summary>
[DoNotSerialize]
[PortLabelHidden]
public ValueOutput firstItem { get; private set; }
protected override void Definition()
{
collection = ValueInput<IEnumerable>(nameof(collection));
firstItem = ValueOutput(nameof(firstItem), First);
Requirement(collection, firstItem);
}
public object First(Flow flow)
{
var enumerable = flow.GetValue<IEnumerable>(collection);
if (enumerable is IList)
{
return ((IList)enumerable)[0];
}
else
{
return enumerable.Cast<object>().First();
}
}
}
}
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