(by @andrestaltz)
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.
# Usage: | |
# 1) Ctr+S downloads page to ~/Desktop/books.html | |
# 2) Run script | |
# 3) Find your books in /tmp/humble_books | |
# 4) Read them | |
# 5) Profit | |
cat ~/Desktop/books.html | | |
grep "https://dl.humble.com" | | |
sed -n -E 's/.data-web\=\"(https://dl.humble.com/([.]+).([a-z]+)?["]+)./\1 \2 \3/p' | | |
sed 's/&/&/g' > /tmp/humble_books_list && cat /tmp/humble_books_list | |
/** | |
* Solves the n-Queen puzzle in O(n!) | |
* Let p[r] be the column of the queen on the rth row (must be exactly 1 queen per row) | |
* There also must be exactly 1 queen per column and hence p must be a permuation of (0 until n) | |
* There must be n distinct (col + diag) and n distinct (col - diag) for each queen (else bishop attacks) | |
* @return returns a Iterator of solutions | |
* Each solution is an array p of length n such that p[i] is the column of the queen on the ith row | |
*/ | |
def nQueens(n: Int): Iterator[Seq[Int]] = | |
(0 until n) |
(by @andrestaltz)
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.
IT'S SHOWTIME | |
HEY CHRISTMAS TREE isLessThan100 | |
YOU SET US UP @NO PROBLEMO | |
HEY CHRISTMAS TREE n | |
YOU SET US UP 0 | |
HEY CHRISTMAS TREE multiple | |
YOU SET US UP @NO PROBLEMO | |
STICK AROUND isLessThan100 |
L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns on recent CPU
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 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 4X memory
Hi there!
The docker cheat sheet has moved to a Github project under https://github.com/wsargent/docker-cheat-sheet.
Please click on the link above to go to the cheat sheet.
// Just before switching jobs: | |
// Add one of these. | |
// Preferably into the same commit where you do a large merge. | |
// | |
// This started as a tweet with a joke of "C++ pro-tip: #define private public", | |
// and then it quickly escalated into more and more evil suggestions. | |
// I've tried to capture interesting suggestions here. | |
// | |
// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_, | |
// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant, |
# -*- coding: utf-8 -*- | |
""" | |
Builds epub book out of Paul Graham's essays: http://paulgraham.com/articles.html | |
Author: Ola Sitarska <ola@sitarska.com> | |
Copyright: Licensed under the GPL-3 (http://www.gnu.org/licenses/gpl-3.0.html) | |
This script requires python-epub-library: http://code.google.com/p/python-epub-builder/ | |
""" |