Adhere to the foundation of 20 minutes go every day II

Variable

Every language needs to use variables , The declaration rules are also different

Similar rules ： Understandable , Unified and standardized naming rules

go Can declare a , You can also declare multiple , Multiple times can be organized with brackets

var (
    numberOne int
    numberTwo int
    numberThree string
)

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Operator

go Supported operators

• Arithmetic operator
• Logical operators

Arrays and slices

arr1 := [4]int{1,2,3}
slice1 := []int{1,2,3}
slice2 := slice1[1:2]

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Dictionaries

map1 := make(map[string]string)
map1["abc"] = "test"
if val,ok:= map1["a"];ok {
    fmt.Println(val)
}else {
    fmt.Println("error")
}

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Structure

type Location struct {
    Addr string
}
type Person struct{
    Name string
    Age int
    Location
}

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Interface

type DoIt interface{
    Do()string
}

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library ( package ) management

Import package import

Import not used import _ "xxx"

Do not display library name import . "xxx"

Multiple package imports import( a, b, c)

Project organization structure

Domain model

• app
• domain
• infra
• main
• scheduler
• ui
  • api-server
    • api_server.go
    • router_function.go
  • parse
    • parser.go

Business iteration pattern

• cmd
• configs
• deploments
• docs
• initalizers
• logs
• pkg
• scripts
• src
• tools
• verndors
• main.go
• Makefile