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By QuickFix
#78698 Please understand that you'll actually only use the Arduino IDE combined with a separate hardware-core library for the ESP8266 and you'll be writing in C++.

Since the core works just like with a normal "Atmel Arduino" board, you can re-use and for a large part mix Arduino-code for use with the ESP.
To the end user (you) the only real difference are the differences in hardware.