The Go Programming Language

2.1 Names

The names of Go functions, variables, constants, types, statement labels, and packages follow a simple rule: a name begins with a letter (that is, anything that Unicode deems a letter) or an underscore and may have any number of additional letters, digits, and underscores. Case matters: heapSort and Heapsort are different names.

Go has 25 keywords like if and switch that may be used only where the syntax permits; they can’t be used as names.

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break        default      func         interface    select
case         defer        go           map          struct
chan         else         goto         package      switch
const        fallthrough  if           range        type
continue     for          import       return       var

In addition, there are about three dozen predeclared names like int and true for built-in constants, types, ...