StringBuilder.withContent constructor

Creates a StringBuilder with initial content.

initialContent the initial string content

A mutable sequence of characters similar to Java's StringBuilder.

This class provides an efficient way to build strings by appending characters, strings, and other data types.

Example usage:

StringBuilder sb = StringBuilder();
sb.append("Hello");
sb.append(" ");
sb.append("World");
sb.append("!");

print(sb.toString()); // "Hello World!"
print(sb.length()); // 12