// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.

namespace Microsoft.ClearScript
{
    /// 
    /// Represents an undefined value.
    /// 
    /// 
    /// Some script languages support one or more special non-null values that represent
    /// nonexistent, missing, unknown, or undefined data. The ClearScript library maps such values
    /// to instances of this class.
    /// 
    public class Undefined
    {
        /// 
        /// The sole instance of the  class.
        /// 
        public static readonly Undefined Value = new Undefined();

        private Undefined()
        {
        }

        #region Object overrides

        /// 
        /// Returns a string that represents the current object.
        /// 
        /// A string that represents the current object.
        /// 
        /// The  version of this method returns "[undefined]".
        /// 
        public override string ToString()
        {
            return "[undefined]";
        }

        #endregion
    }
}