# README

## Go

Playground: [play.golang.org](https://github.com/jsfuentes/Code-Cheatsheet/tree/cfa54859c01d276d596fdd857a971a04980468a2/Go/play.goland.org)

### Overview

* Compiled exec OS specific and have statically linked runtime(contains all needed libs)
* Custom types can implement interfaces and have methods
* Custom structs have member fields
* GO's class with no inheritance, no constructors, no generics(operator overloading), no exception handling, no implicit numeric conversions
* Next-gen succient C 
* Garbage Collection, mem reclaimed when objects out of scope of set to nil very fast
* Scopes to blocks 
* Great concurrency(Goroutine, channel, select) 

#### CLI

`go run [file]`

`go build [file]`

`godoc [package]` ie. `godoc fmt` gives you all exported functions and comments

`gofmt -w [file]` To override and format file

### Hello World

```go
package main

import(
  "fmt"
  "strings"
)

func main() {
  fmt.Println("Hello from Go!")
  fmt.Println(strings.ToUpper("Hello really loud"))
}
```

Exported fts and fields have initial upper-case character

starting brace must be on same line

*builtin* package

## Workspace

Needed to have multi-files and install libs

### Setup

Make the following dir struct:

\[folder]

​ bin #for exec

​ pkg #for intermediate

​ src

​ \[package name]

​ \[filename].go

Then `export GOPATH=[folder path]`

Startup file has `package main` at top and a `func main`

Now `go install` in the \[package name] folder will create stuff in bin

`go install [package name]` will work anywhere and install package

### Packages

All files in a package must use the same *name*

under src>stringutil>stringutil.go

```go
package stringutil

func FullName(s, l) {
    //....
}
```

In other package

```go
package main

import (
    "stringutil"
)

func main() {
    author := stringutil.FullName("Jorge", "Fuentes")
}
```