Helper functions for parsing dynamic list ports in the xNode open-source node editing framework for Unity.

xNodeDynamicListParsing.cs

// Example output ports and how we can use them:
[Output(dynamicPortList = true)]
public string[] stringOutputs;

[Output(dynamicPortList = true)]
public float[] floatOutputs;

public override object GetValue(NodePort port) {
    // Boilerplate reduction: instead of parsing ports manually every single time, just "expose" a function for the index, if it matches
    // You can even chain them with null coalescing in order to not check subsequent fields after one is found
    this.WithDynamicListPort(port, nameof(stringOutputs), i => stringOutputs[i]) ??
    this.WithDynamicListPort(port, nameof(floatOutputs), i => floatOutputs[i]);
}


///////////////////////////////////////////////////////
// And somewhere else... (C# 7!)
public static class NodeExtensions {
    // ReSharper disable once SuggestBaseTypeForParameter, MemberCanBePrivate.Global
    public static int GetDynamicListPortIndex(this Node caller, NodePort port, string prefix) {
        if (port.node != caller) return -1; // you may or may not want this depending on what you want with this
        var success = int.TryParse(port.fieldName.Split(' ')[1], out var result);
        return port.fieldName.StartsWith(prefix) && success ? result : -1;
    }

    public static object WithDynamicListPort(this Node caller, NodePort port, string prefix, Func<int, object> function) {
        var index = caller.GetDynamicListPortIndex(port, prefix);
        return index == -1 ? null : function(index);
    }

    public static T WithDynamicListPort<T>(this Node caller, NodePort port, string prefix, Func<int, T> function) {
        var index = caller.GetDynamicListPortIndex(port, prefix);
        return index == -1 ? default : function(index);
    }
}

Thank you! It was a big help!