What's the Most Efficient Way to Create a String of Tabs in C#?

Efficient Character Repetition in C#

In C#, there are various approaches to generate a string consisting solely of tab characters ("t"). This article examines three commonly used methods and offers an alternative solution that combines simplicity and performance.

LINQ and StringBuilder vs. String Concatenation

The LINQ and StringBuilder approaches provide concise and flexible solutions. LINQ utilizes the Repeat and Aggregate methods, while StringBuilder allows for incremental string manipulation. However, both these methods involve more complex operations than simple string concatenation.

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

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

    return sb.ToString();
}

Direct String Construction

The direct string concatenation approach, as shown below, is straightforward and offers the best performance among the three methods.

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

Optimal Solution: Constructor-based String Creation

For maximum simplicity and performance, consider using the constructor-based solution:

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

This method initializes a new string object directly with the specified character repeated the given number of times, resulting in the most efficient solution for generating tabbed strings.

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