mojo-stringbuilder is a library for the Mojo programming language that provides a StringBuilder class for efficient string concatenation. It is designed to be a faster alternative to using the + operator for concatenating strings, especially when dealing with large or multiple strings.

• Efficient string concatenation using a dynamic vector
• Avoids the overhead of creating and destroying intermediate strings
• Approximately 10x faster than using the + operator for large concatenations
• Easy-to-use API for appending, accessing, and setting strings

To use mojo-stringbuilder, clone the repository into your project's vendor directory:

git clone https://github.com/yourusername/mojo-stringbuilder.git vendor/stringbuilder

Then, import the StringBuilder class in your Mojo code:

from stringbuilder import StringBuilder

from stringbuilder import StringBuilder

fn main():
  var sb = StringBuilder()
  sb.append("Hello, ")
  sb.append("world!")
  print(sb)  # Output: Hello, world!

The following example demonstrates the performance difference between using StringBuilder and the + operator for string concatenation:

from stringbuilder import StringBuilder
from time import now

fn main():
  var sb = StringBuilder()
  var startTime = now()
  for i in range(1000):
    sb.append("Some long string to be concatenated. ")
  var endTime = now()
  print("StringBuilder time: ", endTime - startTime, "ns")

  var strConcat = ""
  startTime = now()
  for i in range(1000):
    strConcat = strConcat + "Some long string to be concatenated. "
  endTime = now()
  print("String + operator time: ", endTime - startTime, "ns")

Special thanks to @Michael Kowalski and @Benny from the Mojo Discord server for their help and support in developing this library.