// Copyright (c) .NET Foundation. All rights reserved.

// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System.Collections.Generic;

namespace System.Text

{

internal static class StringBuilderExtensions

{

public static StringBuilder AppendJoin(

this StringBuilder stringBuilder, IEnumerable<string> values, string separator = ", ")

=> stringBuilder.AppendJoin(values, (sb, value) => sb.Append(value), separator);

public static StringBuilder AppendJoin<T>(

this StringBuilder stringBuilder, IEnumerable<T> values, Action<StringBuilder, T> joinAction,

string separator)

{

var appended = false;

foreach (var value in values)

{

joinAction(stringBuilder, value);

stringBuilder.Append(separator);

appended = true;

}

if (appended)

{

stringBuilder.Length -= separator.Length;

}

return stringBuilder;

}

}

}