The ESP8266 is everywhere now. Whenever you buy some cheap Chinese (or even expensive non-Chinese) IoT device, like a WiFi power switch, a WiFi connected lightbulb, or whatever, you can pretty much guarantee that inside will be an ESP8266.

Xtensa have pretty much got it made.

But what is it that's so great about the ESP8266 that's got everyone using it?

This is my attempt to collate and explain the most common errors and warnings you get when compiling code for the Arduino and Arduino-like boards.

Errors

Expected primary expression before '.' token

This is usually because you used a class name instead of an instance of a class. One example would be if you created an instance of the LiquidCrystal class:

LiquidCrystal lcd(4, 5, 6, 7, 8, 9, 10);

And then used something like:

LiquidCrystal.print("foo");

instead of:

This is my list of windows versions that I rank by my opinion of their usability and abilities "of their time". That is, not ranked by comparing them to current standards, but comparing them purely by how they operated in their hayday. This is purely my opinion, and you will most likely disagree with it.

Personally I don't have much respect for Windows, but it did have a few highlights during its time. So here goes. I award the number one spot to: