StartsWith.cs

using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.Script.Functions.Strings
{
    public class StartsWith : FunctionTwoScalarVariables
    {
        public StartsWith(ScriptNode String, ScriptNode Substring, int Start, int Length, Expression Expression)
            : base(String, Substring, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(StartsWith);
 
        public override string[] DefaultArgumentNames => new string[] { "String", "Substring" };
 
        public override bool UpgradeScalarsToSameSet => true;
 
        public override IElement EvaluateScalar(string Argument1, string Argument2, Variables Variables)
        {
            return Argument1.StartsWith(Argument2) ? BooleanValue.True : BooleanValue.False;
        }
    }
}