Umberto Raimondi uraimo

A slightly updated version of this doc is here on my website.

Why I Like Go

I visited with PagerDuty yesterday for a little Friday beer and pizza. While there I got started talking about Go. I was asked by Alex, their CEO, why I liked it. Several other people have asked me the same question recently, so I figured it was worth posting.

Goroutines

The first 1/2 of Go's concurrency story. Lightweight, concurrent function execution. You can spawn tons of these if needed and the Go runtime multiplexes them onto the configured number of CPUs/Threads as needed. They start with a super small stack that can grow (and shrink) via dynamic allocation (and freeing). They are as simple as go f(x), where f() is a function.

Since this is on Hacker News and reddit...

No, I don't distribute my résumé like this. A friend of mine made a joke about me being the kind of person who would do this, so I did (the link on that page was added later). My actual résumé is a good bit crazier.
I apologize for the use of _t in my types. I spend a lot of time at a level where I can do that; "reserved for system libraries? I am the system libraries".
Since people kept complaining, I've fixed the assignments of string literals to non-const char *s.
My use of type * name, however, is entirely intentional.
If you're using an older compiler, you might have trouble with the anonymous unions and the designated initializers - I think gcc 4.4 requires some extra braces to get them working together. Anything reasonably recent should work fine. Clang and gcc (newer than 4.4, at le

	package main

	import (
	"code.google.com/p/go-tour/pic"
	"image"
	"image/color"
	)

	func Sqrt(f int) int {
	var z int = 1

	package main

	import "code.google.com/p/go-tour/pic"

	func Fact(x uint8) uint8 {
	if x>1 {
	return x * (x-1)
	}
	return x+1
	}

	package main

	import (
	"code.google.com/p/go-tour/wc"
	)

	func WordCount(s string) map[string]int {
	res := make(map[string]int);
	str := make([]rune,0,10)
	for _, r := range(s){

	package main

	import "fmt"

	// fibonacci is a function that returns
	// a function that returns an int.
	func fibonacci() func() int {
	a,b := 0,1
	return func() int{
	res := a

	// Taken from the commercial iOS PDF framework http://pspdfkit.com.
	// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
	// Licensed under MIT (http://opensource.org/licenses/MIT)
	//
	// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.

	// PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit.

	#import <objc/runtime.h>
	#import <objc/message.h>

	file_to_disk = './tmp/large_disk.vdi'

	Vagrant::Config.run do \|config\|
	config.vm.box = 'base'

	config.vm.customize ['createhd', '--filename', file_to_disk, '--size', 500 * 1024]
	config.vm.customize ['storageattach', :id, '--storagectl', 'SATA Controller', '--port', 1, '--device', 0, '--type', 'hdd', '--medium', file_to_disk]
	end

	sed -E -e 's/^/ /g' -e 's/^ --- ?//g' \| pandoc -o listing.pdf -

	That expression is a cheap literate programming system for Markdown.
	Start commentary lines with '--- ' and they will be
	markdown-formatted, the rest will be code. (Uses Lua comment syntax.)

	Finally the right implementation of this idea:
	http://fresh.homeunix.net/~luke/misc/emacs/pbook.pdf (program)
	http://fresh.homeunix.net/~luke/misc/erlang/regtest.pdf (better example)

	package main

	// build +cgo

	import (
	"fmt"
	"os"
	"unsafe"
	)