The Go Programing Language 1
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The document provides an overview of the Go programming language, detailing its characteristics as a compiled, garbage-collected, and concurrent language, with emphasis on its efficient performance and ease of use. It covers Go's development, including its origins at Google, modularization through packages, and fundamental programming concepts such as variables, types, pointers, and user-defined types. Additionally, it discusses the absence of object-oriented features like classes in Go, highlighting how functions and structs are utilized instead.
The Go Programing Language 1
- 1. The Go Programming Language By İbrahim Kürce Quoted from John Sonmez Three chapters: Go Overview, Go Development and Variables, Types, Pointers
- 2. 1 – Go Overview – What is Go? Compiled Garbage-collected Concurrent
- 3. Compiled Code adapted to machine that they’re running on Compiled down to machine languages like C, C++ More efficient and better performance than interpreted languages Supported operating systems: Linux, Mac OS X, FreeBSD, OpenBSD, Plan 9, Windows Supported processors: i386, amd64, ARM
- 4. Garbage-collected You do not have to manage memory as programmer, unlike C, C++ Runtime handles for you Garbage collection is very fast, latency free
- 5. Concurrent Concurrency is to do more than one thing at a time Programming languages like C++ and Java, concurrency is possible but hard to manage. It is not part of language Go has built in concurrency support It is called Go Routines for concurrent functions
- 6. Go’s Origins Three Google engineers want a system level languages for aging systems level languages Go was designed very fast compiling language Sept 2007 Dream of Go March 2012 Go 1 released May 2010 Used internally at Google Nov 2009 Officially announced
- 7. What makes Go different? Efficient like a static language, ease of use like dynamic language Type-safe and memory-safe Latency free garbage collection Fast compile times It does not have assertions and method overloading
- 8. 2 – Go Development - Packages Way to modularize code Similar to namespaces Collection of types and functions Can import packages in your code Redistribute those packages A lot of built-in packages, https://golang.org/pkg/
- 10. Imports Go knows whether your code needs those packages Has ability to go out and get remote packages Your code could refer to github etc. repositories
- 11. Hello World package main Required package name "main" import "fmt" Package comes with Go func main(){ Curly braces is near by function name fmt.Println("Hello World") } Println start with upper case, cause it is exported method
- 12. Hello World Direct run, not generate .exe file go run hello.go To Build to generate .exe file go build hello.go To run after build hello.exe
- 13. 3 – Variables, Types and Pointers Basic Types bool string int, int8, int16, int32, int64 uint, uint8, uint16, uint32, uint64, uintptr byte(unit8) rune(int32), like a char float32, float64 complex64, complex128
- 14. Types Other types Array Slice Struct Pointer Function Interface Map Channel
- 17. Multi-Declaration and Initialization Default value is 0 for int types Default value is always set in Go language Without Types Without var
- 18. Multi-Declaration and Initialization Do not need to have same type in multi-declaration
- 19. Pointer Basics Pointer is a type of variable that is going to contain a memory address of another variable string pointer has same type with string type Hello World 0xc042 00a270
- 20. Pointer Basics, Passing Things Pointer’s type is that type is going to refer to what type of variable We pass value in Go function, this value will be copied, inside function, we change this value, originial value is not changed function 43 43 function 43 45
- 21. Passing Things If we pass a pointer to function, pointer also will be copied but it points same memory location. So if we change value inside function, originial value will also be changed function 43 0x0123 0x0123
- 22. Basic Pointer Example greeting is a pointer, if we write it directly, it shows memory address If we write *greeting, it shows Hello world
- 23. Pointer Assignment If we change value of pointer, we also change originial value
- 24. No Classes in Go Go is not object-oriented language Instead of using classes in Go, we use what’s called user define types For example;
- 25. Basic User Types Salutation struct definition
- 26. Constants In Go, you can define constants without defining the type PI is numeric, Language is string type A, B, C = 0, 1, 2 respectively
- 27. End of Go Overview, Go Development and Variables, Types, Pointers