go-tutorial

go-tutorial

Links

The Go Playground: https://play.golang.org/ Go: https://golang.org

GO

Help Documentation Examples

  go doc json.Decoder.decode
  go doc json.Decoder
  go doc json

##Editors Visual Studio Code: https://code.visualstudio.com Goland: https://www.jetbrains.com/go/

GO

go run main.go go run github.com/thampton/go-tutorial

Variables

3 ways to initialize - (keyword var)

Implicit initialization := is most common

Local Variables must be used or results in compiler error

int, float32, float64, boolen, complex (real imag)

Pointers

Location in memory that holds variable for usi

nil indicates a pointer not pointing to anything

* dereferences pointers and indicates type is a pointer

No pointer arithmetic

& is the address of operator

Constants

keyword const, can use implict type but must assign value

const blocks and iota allow for advanced constant patterns

Collections

Arrays - brackets go before size and Arrays are constant size

Slices

• : operator - complete array or slice, or range
• Slice constructed from fixed size array points to that array
• Slice constructed without fixed size, is dynamically sized and managed by go

Maps - Key Value Pairs - Can specify key and value types.

Struct - Only Data Type that can contain multiple data types

Program Flow

Loops - For loop only - 4 types

• loop till condition
• loop till condition with post clause
• infinite loops - for ; ; { or for {
• loop over collections - for i, v range := slice or for _, v range := slice

break exists continue exists _ readonly value

Panic - Throws Exception

Switch Cases break by default Default case keyword break and fallthrough