Golang package builtin 中内置函数我分为两部分介绍，第一部分为基础类型，第二部分为包含函数、接口，较复杂一些

第一部分

// bool is the set of boolean values, true and false.
type bool bool// true and false are the two untyped boolean values.
const (true  = 0 == 0 // Untyped bool.false = 0 != 0 // Untyped bool.
)// uint8 is the set of all unsigned 8-bit integers.
// Range: 0 through 255.
type uint8 uint8// uint16 is the set of all unsigned 16-bit integers.
// Range: 0 through 65535.
type uint16 uint16// uint32 is the set of all unsigned 32-bit integers.
// Range: 0 through 4294967295.
type uint32 uint32// uint64 is the set of all unsigned 64-bit integers.
// Range: 0 through 18446744073709551615.
type uint64 uint64// int8 is the set of all signed 8-bit integers.
// Range: -128 through 127.
type int8 int8// int16 is the set of all signed 16-bit integers.
// Range: -32768 through 32767.
type int16 int16// int32 is the set of all signed 32-bit integers.
// Range: -2147483648 through 2147483647.
type int32 int32// int64 is the set of all signed 64-bit integers.
// Range: -9223372036854775808 through 9223372036854775807.
type int64 int64// float32 is the set of all IEEE-754 32-bit floating-point numbers.
type float32 float32// float64 is the set of all IEEE-754 64-bit floating-point numbers.
type float64 float64// complex64 is the set of all complex numbers with float32 real and
// imaginary parts.
type complex64 complex64// complex128 is the set of all complex numbers with float64 real and
// imaginary parts.
type complex128 complex128// string is the set of all strings of 8-bit bytes, conventionally but not
// necessarily representing UTF-8-encoded text. A string may be empty, but
// not nil. Values of string type are immutable.
type string string// int is a signed integer type that is at least 32 bits in size. It is a
// distinct type, however, and not an alias for, say, int32.
type int int// uint is an unsigned integer type that is at least 32 bits in size. It is a
// distinct type, however, and not an alias for, say, uint32.
type uint uint// uintptr is an integer type that is large enough to hold the bit pattern of
// any pointer.
type uintptr uintptr// 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

主要注意几个点：

type int int 大小至少32位也就是至少4字节，为什么说是至少呢？因为int类型所占字节数跟操作系统有关，如果是32位就是4个字节，如果是64位就是8个字节，type int int 和type int32 int32不同，int32永远是32位，int64永远是64位。
type string string string可能是空，但不能为nil，这一点和Java不同，Java中String可以为null。string是不可变的，这一点和Java相同。
type uintptr uintptr 是一个integer类型，空间足够大可存储任何指针。
byte 和uint8类型是相同的，可以说是uint8的别称，byte更简单一些。
rune和int32类型是相同的，rune更简单一些。

第二部分

any

// any is an alias for interface{} and is equivalent to interface{} in all ways.
type any = interface{}

any和interface{} 是相同的，不要以为是泛型关键词，为了少写一些字母所以会用any，下面举了一个例子

 func convert(t any){switch t.(type){case int://case string://case bool://}}func main() {f(2)f(true)f("煎鱼好！")}

comparable

// comparable is an interface that is implemented by all comparable types
// (booleans, numbers, strings, pointers, channels, arrays of comparable types,
// structs whose fields are all comparable types).
// The comparable interface may only be used as a type parameter constraint,
// not as the type of a variable.
type comparable interface{ comparable }

comparable是由所有可比较类型（包括booleans, numbers, strings, pointers, channels,interface, arrays中元素为可比较类型,
以及structs 中所有属性都是可比较类型）实现的接口。只能用于类型参数约束，不用于变量类型比较，举个

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【源码阅读】【苦练基本功】Golang内置函数分析

第一部分

第二部分

any

comparable

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