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                               Method |       Mean |     Error |     StdDev |     Median |  Gen 0 | Allocated |
------------------------------------- |-----------:|----------:|-----------:|-----------:|-------:|----------:|
                Lyrcaxis_OriginalCode | 2,553.6 ns | 49.699 ns |  53.177 ns | 2,548.6 ns | 0.1526 |     891 B |
                        StringBuilder | 1,908.8 ns | 31.472 ns |  24.571 ns | 1,896.5 ns | 0.0687 |     417 B |
                         StringConcat | 1,990.0 ns | 38.910 ns |  36.396 ns | 1,980.9 ns | 0.1068 |     626 B |
                            NoPadLeft | 2,213.3 ns | 78.367 ns | 231.066 ns | 2,107.1 ns | 0.0992 |     578 B |
              StringBuilder_NoPadLeft | 1,891.5 ns | 37.899 ns | 105.646 ns | 1,857.5 ns | 0.0553 |     321 B |
                                 Math | 1,887.0 ns | 43.834 ns | 129.244 ns | 1,844.5 ns | 0.1163 |     674 B |
                   StringBuilder_Math | 1,577.2 ns | 31.641 ns |  40.016 ns | 1,571.8 ns | 0.0381 |     225 B |
               Math_And_Prebuilt_Days |   448.1 ns | 14.374 ns |  41.931 ns |   438.2 ns | 0.0973 |     562 B |
 StringBuilder_Math_And_Prebuilt_Days |   150.8 ns |  3.137 ns |   8.154 ns |   149.3 ns | 0.0179 |     104 B |
using System;
using System.Text;
using BenchmarkDotNet.Attributes;
namespace BenchmarkFull
{
// @Lyrcaxis on the C# discord asked for help improving the string interpolation code below, and someone dared suggest that string.Concat wasn't good
// and I couldn't let that rest!
[MemoryDiagnoser]
public class TimeFormatting
{
// credit to @sc_holden for thinking of doing this
private readonly string[] PrebuiltDaysString = new string[] {
") " + DayOfWeek.Sunday+ " ",
") " + DayOfWeek.Monday + " ",
") " + DayOfWeek.Tuesday + " ",
") " + DayOfWeek.Wednesday+ " ",
") " + DayOfWeek.Thursday+ " ",
") " + DayOfWeek.Friday+ " ",
") " + DayOfWeek.Saturday+ " "
};
private DayOfWeek Day = DateTime.Now.DayOfWeek;
private int Week = 12; // actually week number
private int Hour = DateTime.Now.Hour;
private int Minute = DateTime.Now.Minute;
private int Second = DateTime.Now.Second;
private StringBuilder builder = new StringBuilder();
[Benchmark]
public string Lyrcaxis_OriginalCode()
{
return $"({(int)Day + (Week * 7)}) {Day} {Hour:00}:{Minute:00}:{Second:00}";
}
[Benchmark]
public string StringBuilder()
{
builder.Clear();
builder.Append("(");
builder.Append((int)Day + (Week * 7));
builder.Append(") ");
builder.Append(Day);
builder.Append(" ");
builder.Append(Hour.ToString().PadLeft(2, '0'));
builder.Append(":");
builder.Append(Minute.ToString().PadLeft(2, '0'));
builder.Append(":");
builder.Append(Second.ToString().PadLeft(2, '0'));
return builder.ToString();
}
[Benchmark]
public string StringConcat()
{
return "(" +
((int)Day + (Week * 7)) +
") " +
Day +
" " +
Hour.ToString().PadLeft(2, '0') +
":" +
Minute.ToString().PadLeft(2, '0') +
":" +
Second.ToString().PadLeft(2, '0');
}
[Benchmark]
public string NoPadLeft()
{
return "(" +
((int)Day + (Week * 7)) +
") " +
Day +
" " +
(Hour < 10 ? "0" : "") + Hour +
":" +
(Minute < 10 ? "0" : "") + Minute +
":" +
(Second < 10 ? "0" : "") + Second;
}
[Benchmark]
public string StringBuilder_NoPadLeft()
{
builder.Clear();
builder.Append("(");
builder.Append((int)Day + (Week * 7));
builder.Append(") ");
builder.Append(Day);
builder.Append(" ");
if (Hour < 10)
{
builder.Append("0");
}
builder.Append(Hour);
builder.Append(":");
if (Minute < 10)
{
builder.Append("0");
}
builder.Append(Minute);
builder.Append(":");
if (Second < 10)
{
builder.Append("0");
}
builder.Append(Second);
return builder.ToString();
}
[Benchmark]
public string Math()
{
return "(" +
((int)Day + (Week * 7)) +
") " +
Day +
" " +
(char)((Hour / 10) + 48) +
(char)((Hour % 10) + 48) +
":" +
(char)((Minute / 10) + 48) +
(char)((Minute % 10) + 48) +
":" +
(char)((Second / 10) + 48) +
(char)((Second % 10) + 48);
}
[Benchmark]
public string StringBuilder_Math()
{
builder.Clear();
builder.Append("(");
builder.Append((int)Day + (Week * 7));
builder.Append(") ");
builder.Append(Day);
builder.Append(" ");
builder.Append((char)((Hour / 10) + 48));
builder.Append((char)((Hour % 10) + 48));
builder.Append(":");
builder.Append((char)((Minute / 10) + 48));
builder.Append((char)((Minute % 10) + 48));
builder.Append(":");
builder.Append((char)((Second / 10) + 48));
builder.Append((char)((Second % 10) + 48));
return builder.ToString();
}
[Benchmark]
public string Math_And_Prebuilt_Days()
{
var dayNumber = (int)Day;
return "(" +
(dayNumber + (Week * 7)) +
") " +
PrebuiltDaysString[dayNumber] +
" " +
(char)((Hour / 10) + 48) +
(char)((Hour % 10) + 48) +
":" +
(char)((Minute / 10) + 48) +
(char)((Minute % 10) + 48) +
":" +
(char)((Second / 10) + 48) +
(char)((Second % 10) + 48);
}
[Benchmark]
public string StringBuilder_Math_And_Prebuilt_Days()
{
var dayNumber = (int)Day;
builder.Clear();
builder.Append("(");
builder.Append(dayNumber + (Week * 7));
builder.Append(PrebuiltDaysString[dayNumber]);
builder.Append((char)((Hour / 10) + 48));
builder.Append((char)((Hour % 10) + 48));
builder.Append(":");
builder.Append((char)((Minute / 10) + 48));
builder.Append((char)((Minute % 10) + 48));
builder.Append(":");
builder.Append((char)((Second / 10) + 48));
builder.Append((char)((Second % 10) + 48));
return builder.ToString();
}
}
}
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