ScalarSum.cs

using System.Collections.Generic;
using System.Linq;

namespace Unity.VisualScripting
{
    /// <summary>
    /// Returns the sum of two or more scalars.
    /// </summary>
    [UnitCategory("Math/Scalar")]
    [UnitTitle("Add")]
    public sealed class ScalarSum : Sum<float>, IDefaultValue<float>
    {
        [DoNotSerialize]
        public float defaultValue => 1;

        public override float Operation(float a, float b)
        {
            return a + b;
        }

        public override float Operation(IEnumerable<float> values)
        {
            return values.Sum();
        }
    }
}