jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

drewolson

package main

import (
	"fmt"
	"reflect"
)

type Foo struct {
	FirstName string `tag_name:"tag 1"`
	LastName  string `tag_name:"tag 2"`

temoto

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"fmt"
)

func EncryptAESCFB(dst, src, key, iv []byte) error {
	aesBlockEncrypter, err := aes.NewCipher([]byte(key))

kachayev

-module(channels).
-compile(export_all).

make() ->
    Ref = make_ref(),
    Pid = spawn(?MODULE, channel, [Ref]),
    {channel, Pid, Ref}.

channel(Ref) ->
    receive

n00neimp0rtant

## within current branch, squashes all commits that are ahead of master down into one
## useful if you merged with upstream in the middle of your commits (rebase could get very ugly if this is the case)
 
## commit any working changes on branch "mybranchname", then...
git checkout master
git checkout -b mybranchname_temp
git merge --squash mybranchname
git commit -am "Message describing all squashed commits"
git branch -m mybranchname mybranchname_unsquashed
git branch -m mybranchname

hvoecking

// Traverses an arbitrary struct and translates all stings it encounters
//
// I haven't seen an example for reflection traversing an arbitrary struct, so
// I want to share this with you. If you encounter any bugs or want to see
// another example please comment.
//
// The MIT License (MIT)
//
// Copyright (c) 2014 Heye Vöcking
//

hyg

func openbrowser(url string) {
	var err error

	switch runtime.GOOS {
	case "linux":
		err = exec.Command("xdg-open", url).Start()
	case "windows":
		err = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
	case "darwin":
		err = exec.Command("open", url).Start()

szaydel

Unix domain socket server and client There are three types of unix domain socket.

"unix" corresponds to SOCK_STREAM "unixdomain" corresponds to SOCK_DGRAM "unixpacket" corresponds to SOCK_SEQPACKET When you write a “unix” or “unixpacket” server, use ListenUnix().

 l, err := net.ListenUnix("unix",  &net.UnixAddr{"/tmp/unixdomain", "unix"})

s-panferov

interface Option<T> {
    map <U>(fn: (a: T) => U): Option<U>;
    isSome(): boolean;
    isNone(): boolean;
    isSomeAnd(fn: (a: T) => boolean): boolean;
    isNoneAnd(fn: () => boolean): boolean;
    unwrap(): T;
    unwrapOr(def: T): T;
    unwrapOrElse(f: () => T): T;
    map<U>(f: (a: T) => U): Option<U>;

santiaago

package main

import (
	"bytes"
	"flag"
	"image"
	"image/color"
	"image/draw"
	"image/jpeg"
	"log"