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![Syntax
/* C */
//Expression Syntax
int main(int argc, char *argv[])
// The Clockwise-Spiral Rule in C syntax parsing
int (*(*fp)(int (*)(int, int), int))(int, int)
/* Go */
// Type Syntax
func main(argc int, argv []string) int
//Left to right
f func(func(int,int) int, int) func(int, int) int](https://image.slidesharecdn.com/introduction-to-go-programming-160217044323/75/Introduction-to-Go-programming-19-2048.jpg)
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Introduction to Go programming
The document provides an introduction to the Go programming language, emphasizing its purpose to improve the working environment for developers by addressing modern challenges in programming. Key features of Go include lightweight design, faster compilation times, concurrency support, and a clean syntax that differentiates it from C. The document highlights the evolution of Go since its inception in 2007 and describes various aspects of its syntax, memory management, and concurrency model.
Introduction to Go programming
- 1.
- 2. Agenda Modern Compute Environment Focus:What Problem does it Solve? History How is it Achieved For C Programmers - Major Differences
- 3. Challenges in Modern ComputeLandscape
- 4. Environment Multi-Core Networked Systems Computational Clusters WebProgramming Model Thousands of Programmers Same code base Scale of Development
- 5. Legacy Languages Language FeatureComplex Garbage Collection Missing language support for Concurrency Compilation Times Dependency Management
- 6. Programmers digress from thereal task! Crux:
- 7.
- 8. โGoโs purpose istherefore not to do research into programming language design; it is to improve the working environment for its designers and their coworkers.โ โRob Pike (Co-Designer of Go and Distinguished Engineer at Google)
- 9.
- 10. History Inception: 2007 Go 1.0released in 2012 Rob Pike, Ken Thompson and Robert Griesemer
- 11. History Binary = 2000X C++ Source Bytes Unused Library Includes Conditional Includes Extremely Slow Compilation Even on Distributed Compilation System!
- 12. Desired Features Light Weight IncreaseProgrammer Efficiency Compiled Language Concurrency Garbage Collection Statically Typed
- 13. How is itAchieved?
- 14. How No unused importpackages Dependency graph is precise No dependency cycles Only exported data available One object both exported and complete data
- 15. How 40X faster compilationtimes than C++!
- 16.
- 17. Syntax Import paths areURLs Cleaner syntax
- 18. Syntax //C typedef struct A{ int a; char b; } //Go type A struct { a int b char }
- 19. Syntax /* C */ //ExpressionSyntax int main(int argc, char *argv[]) // The Clockwise-Spiral Rule in C syntax parsing int (*(*fp)(int (*)(int, int), int))(int, int) /* Go */ // Type Syntax func main(argc int, argv []string) int //Left to right f func(func(int,int) int, int) func(int, int) int
- 20. Syntax //Go can alsoreturn multiple value from function func ReadFile(r io.Reader) (num int, err error) { ... } ... n, err := ReadFile(r)
- 21. Syntax package util //Counter isvisible when package is imported var Counter int //name is not var name string //Seen func ThisIsAlsoAvailable() error { } //not seen func thisIsAPrivateFunction() error { }
- 22.
- 23. Semantics No pointer arithmetics Noimplicit numeric conversions Array bounds are always checked types are not type aliases type X int // X and int are distinct Interface types Reflection Type switch
- 24. Concurrency Go Routines Channels -Communication Pipes
- 25. Concurrency Light-weight threads ofexecution Managed by Go Runtime Run concurrently with other go routines Example Shared resource manager Querier DB Reader etc... Go Routines
- 26. Concurrency package main import โfmtโ funcmyPrinter(str string) { fmt.Println(str) } func main() { myPrinter(โoneโ) go myPrinter(โmaybetwoโ) go myPrinter(โmaybethreeโ) } //Output one maybetwo Maybethree //Or one maybethree maybetwo //Or one ...
- 27. Concurrency Shared pipes connectingconcurrent go routines Channels
- 28. Concurrency package main import "fmtโ funcmain() { messages := make(chan string) // Send a value `channel <-` go func() { messages <- "ping" }() //continued //continued // Receive a value `<-channel` msg := <-messages fmt.Println(msg) } //Output ping
- 29. GC Easier for Programmer Nooverhead of memory allocation and freeing No explicit memory freeing
- 30. Interfaces Set of methods Methodson any type Data types implementing all methods satisfy
- 31.