golang中存在豐富的型別，其中一部分型別如byte、rune等是基於底層的整形等基礎型別實現的，熟悉型別對應的基礎型別能夠幫助我們瞭解一些coding中的小技巧，可以基於型別的基礎型別直接使用。
首先了解一下一些內建型別對應的基礎型別，這些都可以在原始碼中builtin.go中找到：

// byte is an alias for uint8 and is equivalent to uint8 in all ways. It is
// used, by convention, to distinguish byte values from 8-bit unsigned
// integer values.
type
 
 byte = uint8

// rune is an alias for int32 and is equivalent to int32 in all ways. It is
// used, by convention, to distinguish character values from integer values.
type rune = int32

// iota is a predeclared identifier representing the untyped integer ordinal
// number of the current const specification in
 
 a (usually parenthesized)
// const declaration. It is zero-indexed.
const iota = 0 // Untyped int.

如下一些小技巧：

s:="abc"
cs := make([]int, 128)
for _, c := range s {
   cs[c] += 1
}