Kenneth at 15:12, 17 May 2014

2014-05-17T15:12:20Z

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Ken Thompson - Unix

Google

Gopher - GopherCon 2014

Utah Go Users Group - http://www.utahgophers.com
* Tues. May 13 @ 6:30pm

The Go Programming Language Specification - The Go Programming Language - http://golang.org/ref/spec

Justifications:
* C++ too complex
* compilation too slow
* programming to difficult
* easy over safety and efficiency

Issues:
* Name "Go" is ungoogable / hastagable (use golang) *** MOST ANNOYING ***

Companies who use Go:
* PayPal
* Github
* MongoDB
* Canonical
* Mozilla
* Stack Overflow
* Puppet Labs

Twitter: #golang

Prediction: Will become dominant language for LaaS and PaaS in 24 months

Go is...
* Compiled
* Strongly typed
* Statically typed
* Garbage collected
* Similar to C syntax
* Capable of statically verified duck typing (via interfaces)
* Open Source

Hello World:
<pre>
package main

import "fmt"

func main() {
fmt.Println("Hello World")
}
</pre>

Note: Semi colons are optional.

Variables:
<pre>
pakcage main

import "fmt"

func main() {
var i, j int = 1, 2
k := 3
c, python, java := true, false, "no!"
fmt.Println(i, j, k, c, python, java)
}
</pre>

When variables are first initialized, they are always set to their "zero" value. There isn't a null value?

Comments:
// comments use C's syntax
/* multi line comment */

Functions:
<pre>
package main

import "fmt"

func add(x int, y int) int {
return x + y
}

func main() {
fmt.Println(...??
}
</pre>

Types:
* bool
* string
* int, int32, ...
* uint, uint8, ...
* byte
* rune alias for int32
* float32
* complex64

Type conversions - no implicit conversions (have to manually cast)

Looping - Go only has 'for'
for i := 0; i < MAX ; i++ { ... }

While:
for ; sum < 1000; { sum += sum }
for sum < 1000 { sum += sum }

If/Else
if x < 0 { ... }
else if x > 0 { ... }
else { ... }

Don't fear Go pointers
<pre>
type Coordinate struct {
X int
Y int
Z int
name string
}

func GCP() *Coordinate {
return &Coordinate{1, 2, 3, "foo"}
}

func main() {
var cp *Coorindate = getCCP()
fmt.Println(cp)
fmt.Printf("%T\n", cp)
...
}
</pre>

Slices

Range
var pow = []int{1, 2, 3}
func main() {
for i, v := range pow {
fmt.Printf("%d: %d\n", i, v)
}
}

for _, v := range pow { ... }
// underscore is special

Maps

Access is marked public/private by the first letter of the member. Public is capital. Private is lowercase.

No assertions?

Structs in Go - instead of classes in Object Oriented Programming
type House struct { }
func (h House) GetHouseName() string { } //method defined outside of struct, but works on House

Interfaces are super important in Go.
type noiser interface{
GetNoise() string
}
type Cow struct{} // empty structs
type Fox struct{}
func (f Fox) GetNoise() string { ... }

[[Category:Go]]

OpenWest 2014/Go - Revision history

Kenneth at 15:12, 17 May 2014