isabella232 / js-number-to-string

Convert doubles and integers to strings using V8's code

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.