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![ArraysArrays
• Numbered sequence of elements of a single type
• var a [5]int
• b:= [5]int{1,2,3,4,5}](https://image.slidesharecdn.com/go-160701021015/75/GO-programming-language-15-2048.jpg)
![SlicesSlices
• Key data type
• s:= make([]int,3)
• b:= []int{1,2,3,4,5}
• b[0:2] // [1 2]](https://image.slidesharecdn.com/go-160701021015/75/GO-programming-language-16-2048.jpg)
![MapsMaps
• Built-in associative data type
• m:= make(map[string]int)
• m[“one”] = 1
• m[“nine”] = 9
• delete (m,“one”)
• n:= map[string]int{“one”: 1, “two”: 2}](https://image.slidesharecdn.com/go-160701021015/75/GO-programming-language-17-2048.jpg)
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Similar to GO programming language
GO programming language
- 1.
- 2. OutlineOutline • GOLANG history •Features • Disadvantages • Learning Go
- 3. Go HistoryGo History • Developed atGoogle in year 2007 by Robert Griesemer, Rob Pike, and Ken Thompson. • Strongly and statically typed, provides inbuilt support for garbage collection and supports concurrent programming. • Announced in November 2009
- 4. Go HistoryGo History • GO usedby • Twitter’s new system architecture for mobile has a service written in Go that handles 5 billions requests per day. • Youtube use Go to manange MYSQL server. • Dropbox has shifted lots of stacks from python to Go
- 6. Features • Clean andSimple • Concurrent • Garbage collection • Fast • Safe • Standard format • Open Source • Has methods but not a conventional object-oriented language
- 7. DisadvantagesDisadvantages • Still avery young language • Go’s tooling is really weird • It is still not so easy to learn Go and it’s difficult to handle errors in it
- 8. Learning GOLearning GO • Environment setup •Install golang(ubuntu): sudo apt-get install golang-go • Install Atom(code editor): sudo apt-get install atom
- 9. Learning GOLearning GO • References website •https://play.golang.org/ • https://tour.golang.org • https://gobyexample.com/ • “Helloworld” program
- 10. Learning GOLearning GO •Types • Variables • Function • Control Structure • Object Oriented • Concurrency
- 11. TypeType • Basic Type –boolean – String – Int, int8, int16, int32, int64; uint, uint8, uint16, uint32, uint64, uintptr – Byte – Rune – Float32, float64 – Complex64, complex128 – Constants
- 12. TypeType • Composite Type –Arrays – Slices – maps – Structs – JSONS – Text and HTML template
- 13. VariablesVariables • Declare oneor more variables • var x,y,z int • Infer the type of initialized variables • var x,y,z = true,false,”hello” • Zero-value initialization • var x int // x = 0 • var y bool // y = false • Short hand • x,y,z:= true,2, “ok” • Grouping • var( x int = 1 y bool = true)
- 14. ConstantsConstants • Constant declaration •Const x = “hello” • Iota • Simplify definitions of incrementing number • Const( Sunday = iota // 0 Monday // 1 Tuesday // 2 Wednesday // 3 )
- 15. ArraysArrays • Numbered sequenceof elements of a single type • var a [5]int • b:= [5]int{1,2,3,4,5}
- 16. SlicesSlices • Key datatype • s:= make([]int,3) • b:= []int{1,2,3,4,5} • b[0:2] // [1 2]
- 17. MapsMaps • Built-in associativedata type • m:= make(map[string]int) • m[“one”] = 1 • m[“nine”] = 9 • delete (m,“one”) • n:= map[string]int{“one”: 1, “two”: 2}
- 18. PointersPointers • Go supportspointer • No pointer arithmetic i:=1 var ip *int = &i fmt.Println(“value”,i) fmt.Println(“pointer”, &i) fmt.Println(“pointer”, ip)
- 19. Control structureControl structure •If • If v := math.Pow(x, n); v < 10 { fmt.Println(v) } • For • Switch • switch os := runtime.GOOS; os { case "darwin": fmt.Println("OS X.") default: fmt.Println(“unknown”) }
- 20. FunctionFunction • Declaration • funcmyFunction(a,b,c int)(int,int){} • Multiple returned values • x,y := myFunction(2,3,4) • _,y := myFunction(2,3,4) • Variadic function • func sum(nums ...int){…code here……} • sum(1,2) • sum(1,2,3)
- 21. FunctionFunction • Anomyous function •Ex: func squares() func() int { var x int return func() int { x++ return x * x } }
- 22. FunctionFunction • Defer • Ex: funcmain() { f := createFile("defer.txt") defer closeFile(f) writeFile(f) }
- 23. FunctionFunction • Named returnvalues • Ex: func split(sum int)(x int) { x = sum * 4 / 9 return }
- 24. Object OrientedObject Oriented •Structs • Method • Interfaces
- 25.
- 26. MethodMethod Basically look likefunction package main import "fmt" type Int int // only type defined in package func (x Int) square() Int { return x * x } func main() { x := Int(5) // type conversion fmt.Printf(x.square()) // Bình phương của 5 là: 25 }
- 27. InterfacesInterfaces - named collectionsof method signatures - no implements keyword
- 28.
- 29. GoroutineGoroutine • A lightweightthread of execution • Ex:
- 30. ChannelChannel • Are thepipes that connect concurent goroutines • Ex:
- 31. ChannelChannel • By default,channels are unbuffered • Make buffered channel
- 32. SelectSelect • Let youwait on multiple channel operations
- 34. Learning GOLearning GO •GO Web Framework • Revel • Martini • Gocraft/web • Gorilla • Gogin
- 35.