Formats doubles and ints using V8's dtoa implementation. The goal is to get the same characters when stringifying numbers as you would get in JavaScript.

Usage:

#include <js-number-to-string.hpp>

#include <iostream>

int main() {
    using namespace JSNumberToString;

    char buffer[kBufferSize];
    std::cout << DoubleToCString(123.456, buffer, kBufferSize) << std::endl;

    return 0;
}

Note that the buffer you pass into DoubleToCString or IntToCString must have at least 100 bytes, as per V8's requirements. It will be null-terminated, e.g. you can append the output directly to a std::string and reuse the buffer.

Performance

This implementation is very similar to doubleconv in Milo Yip's test case.