[Unity] Performance Test – String Concat

Overview

Recommended to use string.Concat() or directly use + operator for better performance.

Test times: 10,000,000
1. PlusOperator: 6825
2. Interpolation: 10037
3. StringFormat: 9940
4. StringConcat: 6822
5. StringJoin: 8255
6. StringBuilder: 7157

Testing Functions

private void PlusOperator()
{
for (int i = 0; i < m_testTimes; i++)
{
var concat = "testing" + i;
}
}

private void Interpolation()
{
for (int i = 0; i < m_testTimes; i++)
{
var concat = $"testing{i}";
}
}

private void StringFormat()
{
for (int i = 0; i < m_testTimes; i++)
{
var concat = string.Format("testing{0}", i);
}
}

private void StringConcat()
{
for (int i = 0; i < m_testTimes; i++)
{
var concat = string.Concat("testing", i);
}
}

private void StringJoin()
{
for (int i = 0; i < m_testTimes; i++)
{
var concat = string.Join("testing", i);
}
}

private void StringBuilder()
{
for (int i = 0; i < m_testTimes; i++)
{
var builder = new StringBuilder("testing");
builder.Append(i);
}
}