What's the Fastest Way to Repeat a Character in C#?

Best Way to Repeat a Character in C#: Optimized for Syntax and Performance

In C#, there are various approaches to create a string composed of repeated characters. To determine the most efficient and suitable method, let's delve into the options:

LINQ Version:

private string Tabs(uint numTabs)
{
    IEnumerable<string> tabs = Enumerable.Repeat("\t", (int) numTabs);
    return (numTabs > 0) ? tabs.Aggregate((sum, next) => sum + next) : "";
}

While the LINQ approach is concise, it introduces unnecessary overhead due to the usage of LINQ operations (Repeat, Aggregate).

StringBuilder Version:

private string Tabs(uint numTabs)
{
    StringBuilder sb = new StringBuilder();
    for (uint i = 0; i < numTabs; i++)
        sb.Append("\t");

    return sb.ToString();
}

The StringBuilder approach is straightforward but may be slightly slower compared to other options due to the memory allocations for the StringBuilder object.

String Version:

private string Tabs(uint numTabs)
{
    string output = "";
    for (uint i = 0; i < numTabs; i++)
    {
        output += '\t';
    }
    return output;
}

The string version is basic and does not require any additional class instances. It is a good option when simplicity and efficiency are prioritized.

Optimized Solution:

To further optimize the string version, consider using the following syntax:

static string Tabs(int n)
{
    return new string('\t', n);
}

This syntax eliminates the need for the loop and provides a direct and efficient way to generate a string of desired length containing the specified character.

Conclusion:

The optimal choice among these options depends on the specific requirements of your application. For performance-critical scenarios, the optimized string version or the new string syntax is recommended. For basic scenarios where simplicity and readability are important, the basic string version is suitable.

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