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quick introduction everything record insights, share experiences, and entertain the public skip to content home development ← older posts golang getting started series 3: go language basics summary posted on march 19, 2019 by joyway i have already introduced the configuration of the go language and the pits that are easy to encounter when i first learn go. you can check the previous article http://quickintro123.com/index.php/tag/golang/ in this article, the following is a basic knowledge of go language for beginners: 1. the basic structure of the go program the following is the basic structure of a go program, including (package declarations, import packages, functions, etc.) package main // define the package name, package main represents a program that can be executed independently, and each go application contains a package named main. import "fmt" // import the package (function, or other element) you need to use func main() { // the entry function of the program. the main function is required for every executable program, and is generally the first function to be executed after startup. fmt.println("hello, world!") } 2. data type go built-in basic data types include basic data types and advanced data types (1) basic data type * boolean type (bool) numerical type * integer type (byte, int/uint, int8/uint8, int16/uint16, int32/uint32, int64/uint64) * floating point type (float32, float64) * plural type (complex64, complex128) string type * go strings are concatenated by a single byte. identify unicode text using utf-8 encoding. (2) advanced data types array slice dictionary (map) channel function structure interface pointer (*xxx, pointer, uintptr) if divided according to the underlying data structure, the value type includes (all basic data types, arrays, structures), and the reference types include (slice, map, channel, function, interface, pointer) 3. variables & constants (1) variable names consist of letters, numbers, and underscores, where the first letter cannot be a number, for example: var name string (2) declaration a. specify the variable type. if you do not assign a value after the declaration, use the default value. var name string name = "jack" b. determine the type of the variable according to the value. var name = "jack" c. short form, omitting var, note age := 10 attention (:=) is the preferred form of using variables (:=) can only be used in function bodies, not in the declaration and assignment of global variables. (:=) the variable on the left should not be declared, otherwise it will cause a compilation error. (3) the data type of a constant can only be boolean, numeric (integer, float, and complex) and string. a. constant declaration: const b string = “abc” b. iota, special constant const ( a = iota b c ) represents a continuous, untyped integer constant, constant declaration statements starting with const, starting from 0, incrementing once without assigning a constant once the constant declaration statement starting with const is returned to 0 4. operator (1) arithmetic operator, a + b, including (+,-,*, /,%,++,–) (2) relational operators, return true or false, a == b , including (==,!=,>,<,>=,<=) (3) logical operators, return true or false, including (&&,||,!) (4) address operator & : return variable storage address (&originalvalue) : pointer variable (*pointervalue) (5) receive operator for receiving channel data or adding data to the channel (intchan<-1, <-intchan) 5. error handling (1) error interface, (errors.new(value), fmt.error(), custom error type) func divide(a, b float64) (result float64, err error) { if b == 0 { result = 0.0 err = errors.new("runtime error: divide by zero") return } else { result = a / b err = nil } return } (2) panic function, panic(value) is used in conjunction with the error interface. var user = os.getenv("user") if user == "" { panic("the user environment variable is not set.") } (3)the recover function, combined with the defer statement, func testb() (err error) { defer func() { //set recovery when an exception occurs if x := recover(); x != nil { err = fmt.errorf("internal error: %v", x) } }() panic("func testb(): panic") } 6. go basic commands the go build command is mainly used for test compilation. during the compilation of the package, the packages associated with it are compiled at the same time if necessary. go build hello.go the go get command is mainly used to dynamically obtain remote code packages. go get github.com/go-sql-driver/mysql the go run command is mainly used to compile and run the go program. go run hello.go the go test command will automatically read the file named *_test.go under the source directory to generate and run the executable file for testing. posted in golang | tagged development , golang | 41 comments golang getting started series 2: learning the pits that the go language needs to pay attention to posted on march 18, 2019 by joyway in the previous chapter, we have already seen the configuration of the go environment. if you don’t understand, please check the previous article go environment construction , in this chapter we will learn the points to note in the basic syntax of the go language. go language basic grammar the basic syntax of go, i will not go into detail here, you can view this article, learn the detailed syntax of go: https://golang.org/doc/ it is best to try the above examples, one by one, this works best. the following is the basic structure of a go program, including (package declarations, import packages, functions, etc.) package main // define the package name, package main represents a program that can be executed independently, and each go application contains a package named main. import "fmt" // import the package (function, or other element) you need to use func main() { // the entry function of the program. the main function is required for every executable program, and is generally the first function to be executed after startup. fmt.println("hello, world!") } go language attention pit no matter what you learn, you will encounter a variety of pits at the beginning. here is a summary of the various pits encountered in the process of learning the go language. anyone who writes c# will have a separate line of “{“, but this is wrong in go. “{” must be on the same line as the method body. the first time i wrote go, i made this mistake and i don’t know where the error is. func main() { fmt.println("hello, world!") } else in the if…else statement must be on the same line as if ‘ } ‘, otherwise compilation error var a int = 30 if a < 20 { fmt.print("a<20") } else { fmt.print("a>=20") } the definition of the package name. you must declare the package name in the first line of the non-comment in the source file, such as: package main. package main represents a program that can be executed independently, and each go application contains a package called main. package main in the go program, a line represents the end of a statement. each statement does not need to end with a semicolon like other languages ​​in the c family, as these tasks are done automatically by the go compiler. if you plan to write multiple statements on the same line, you must use ; artificial distinction, but we do not encourage this practice in actual development. fmt.println("hello, world!") fmt.println("www.fpeach.com") the main() function is required for every executable program, and is generally the first function to be executed after startup. however, there can only be one main() function in each package, otherwise it will report a main redeclared in this block previous declaration at .. error. package main import "fmt" func main() { /* this is my first simple program */ fmt.println("hello, world!") } when functions, structures, etc., begin with an uppercase letter, such as getinfo, objects that use this form of identifier can be used by the code of the outer package. this is called exporting (like in object-oriented

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http://quickintro123.com/index.php/category/learning/
http://quickintro123.com/index.php/2019/03/08/inspirational-sentence-about-learning/
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Whois Information

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Domain Name: QUICKINTRO123.COM
Registry Domain ID: 2355318805_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.name.com
Registrar URL: http://www.name.com
Updated Date: 2019-01-25T02:00:01Z
Creation Date: 2019-01-25T02:00:01Z
Registry Expiry Date: 2020-01-25T02:00:01Z
Registrar: Name.com, Inc.
Registrar IANA ID: 625
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: 7202492374
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: NS1CNB.NAME.COM
Name Server: NS2NSY.NAME.COM
Name Server: NS3CNA.NAME.COM
Name Server: NS4JPZ.NAME.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2019-08-14T23:14:32Z <<<

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Registrars.

  REGISTRAR Name.com, Inc.

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =quickintro123.com

  PORT 43

  TYPE domain

DOMAIN

  NAME quickintro123.com

  CHANGED 2019-01-25

  CREATED 2019-01-25

STATUS
clientTransferProhibited https://icann.org/epp#clientTransferProhibited

NSERVER

  NS1CNB.NAME.COM 162.88.61.47

  NS2NSY.NAME.COM 162.88.60.47

  NS3CNA.NAME.COM 162.88.61.49

  NS4JPZ.NAME.COM 162.88.60.49

  REGISTERED yes

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