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Custom submit button in simple_form and bootstrap 3

Objective

It is easy to add wrappers for input components in simple_form, but it takes some time to modify rendering of buttons ("f.button").

We want to have this in our form:

= f.button :submit_cancel, 'Save'

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

Frontend Development

Attention: the list was moved to

https://github.com/dypsilon/frontend-dev-bookmarks

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Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	module CheckDigit

	class SEDOL

	SEDOL_WEIGHTS = [1,3,1,7,3,9]
	SEDOL_PATTERN = /[B-Db-dF-Hf-hJ-Nj-nP-Tp-tV-Xv-xYyZz\d]{6}/ # http://regexlib.com/REDetails.aspx?regexp_id=1044

	def self.calculate(sedol)
	raise 'Invalid pattern' unless sedol =~ SEDOL_PATTERN

	inputs = %w[
	CollectionSelectInput
	DateTimeInput
	FileInput
	GroupedCollectionSelectInput
	NumericInput
	PasswordInput
	RangeInput
	StringInput
	TextInput

	#!/bin/bash

	set -o errexit
	set -o nounset

	if [[ ${#} -ne 1 ]]
	then
	echo "Usage: ${0} upstart-conf-file" >&2
	exit 1
	fi