blackjack99p

Introduction

The computer driven markets for instruments like stocks and exchange traded stock options, have transformed finance and the flow of capital. These markets are enabled by order matching engines (and the infrastructure that supports this software). Before computer trading networks and matching engines, stocks where traded on cavernous exchange floors and transaction costs where high. When electronic trading fully matured, floor traders were a fading anachronism and transaction costs had been reduced to pennies a share in many cases. Electronic trading could not exist without advanced network infrastructure, but without the software matching engines no shares would change hands. The computer trading networks, the matching engine software has also created a concentrated nexus of potential failure. Failures in these systems have increased as the frequency and volume on the electronic networks has increased. The position of order matching engines in the trading infrastructure makes these systems o

blackjack99p

#!/bin/sh

# Credits: http://stackoverflow.com/a/750191

git filter-branch -f --env-filter "
    GIT_AUTHOR_NAME='Newname'
    GIT_AUTHOR_EMAIL='new@email'
    GIT_COMMITTER_NAME='Newname'
    GIT_COMMITTER_EMAIL='new@email'
  " HEAD

blackjack99p

1. Somewhere on your machine clone the project.
```
> git clone https://github.com/facebook/react-devtools.git
> cd react-devtools
```

2. Switch to the v3 branch
```
> git checkout v3
```

blackjack99p

belongs_to:

1. Assigning an object to a belongs_to association does not automatically save the object. It does not save the associated object either.

has_one:

1. When you assign an object to a has_one association, that object is automatically saved (in order to update its foreign key).
2. In addition, any object being replaced is also automatically saved, because its foreign key will change too
3. If either of these saves fails due to validation errors, then the assignment statement returns false and the assignment itself is cancelled.
4. If the parent object (the one declaring the has_one association) is unsaved (that is, new_record? returns true) then the child objects are not saved. They will automatically when the parent object is saved.

blackjack99p

# Example from: http://snipplr.com/view/37063/

include Rails.application.routes.url_helpers

# set host in default_url_options:
default_url_options[:host] = "localhost"

# can then use:
url_for()

blackjack99p

def delete_failed_job_if
  redis = Resque.redis

  (0...Resque::Failure.count).each do |i|
    string = redis.lindex(:failed, i)
    break if string.nil?

    job = Resque.decode(string)
    should_delete_job = yield job
    next unless should_delete_job

blackjack99p

git commit --amend --author "Stephen Way <way.stephen@gmail.com>" --no-edit && \
git rebase --continue
...
git push origin master --force

blackjack99p

// Get all users
var url  = "http://localhost:8080/api/v1/users";
var xhr  = new XMLHttpRequest()
xhr.open('GET', url, true)
xhr.onload = function () {
	var users = JSON.parse(xhr.responseText);
	if (xhr.readyState == 4 && xhr.status == "200") {
		console.table(users);
	} else {
		console.error(users);

blackjack99p

<?php

function rkv_remove_columns( $columns ) {

	// remove the Yoast SEO columns
	unset( $columns['wpseo-score'] );
	unset( $columns['wpseo-title'] );
	unset( $columns['wpseo-metadesc'] );
	unset( $columns['wpseo-focuskw'] );

blackjack99p

@echo off
SET st3Path=C:\Program Files\Sublime Text 3\sublime_text.exe
 
rem add it for all file types
@reg add "HKEY_CLASSES_ROOT\*\shell\Open with Sublime Text 3"         /t REG_SZ /v "" /d "Open with Sublime Text 3"   /f
@reg add "HKEY_CLASSES_ROOT\*\shell\Open with Sublime Text 3"         /t REG_EXPAND_SZ /v "Icon" /d "%st3Path%,0" /f
@reg add "HKEY_CLASSES_ROOT\*\shell\Open with Sublime Text 3\command" /t REG_SZ /v "" /d "%st3Path% \"%%1\"" /f
 
rem add it for folders
@reg add "HKEY_CLASSES_ROOT\Folder\shell\Open with Sublime Text 3"         /t REG_SZ /v "" /d "Open with Sublime Text 3"   /f