If you have other questions related to ESP8266 please can you post them on the ESP8266 forum though? This post originally doesn't have much to do with your question at all, apart from having I2C in the title.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Nope - I2c.find isn't a built-in method. The reference lists what's available here: http://www.espruino.com/Reference#I2C
If you have other questions related to ESP8266 please can you post them on the ESP8266 forum though? This post originally doesn't have much to do with your question at all, apart from having I2C in the title.