Golang starter

Golang basic syntax and examples.

Run

go run main.go
go build main.go
// => main.exe

// Run files in the same package
go run main.go <file_1>.go

Init Go module

go mod init <module_name>

Init go module could enable to run go test to test the code.

Golang Syntax

Pointers

• &variable: Get the memory address of the value this variable is pointing at.
• *pointer: Get the value this memory address is pointing at.

Array and slice

• Array: Fixed length, cannot be changed, primitive data type
• Slice: Dynamic length

Value Types and Reference Types

Value Types	Reference Types
int, float, string, bool, structs	slices, maps, channels, pointers, functions

Map and Struct

Map	Struct
Reference type	Value type
Key-value collection, All keys must be the same type, All values must be the same type	Group different data, Values can be different types
Use to represent a collection of related properties	Use to represent a "thing" with a lot of different properties
Need to know all the keys at compile time	Don't need to know all the fields at compile time
Key are indexed, can be iterated over	Fields are not indexed, cannot be iterated over

Interfaces

Concrete Type	Interface Type
map, struct, int, string, ...	interface{}