tiagordc

Linux Cheat Sheet

Linux basic information unified from personal notes and bookmarks

• Filesystem Hierarchy Standard
• System Inspection Commands
• Process Management
• systemd Service Manager
• Working with files and folders
• Permissions

mistic100

// 1. Open the browser developper console on the network tab
// 2. Start the video
// 3. In the dev tab, locate the load of the "master.json" file, copy its full URL
// 4. Run: node vimeo-downloader.js "<URL>"
// 5. Combine the m4v and m4a files with mkvmerge

const fs = require('fs');
const url = require('url');
const https = require('https');

tlberglund

Distributed Systems Reading List

Links for Further Reading

• You Can't Sacrifice Partition Tolerance
• Twitter conversation with Jay Kreps about Vector Clocks
• Why Cassandra Doesn't Need Vector Clocks
• Why Vector Clocks are Easy
• Why Vector Clocks are Hard
• Cache is the New RAM
• Neat Algorithms: Paxos

gregoryyoung

Value objects are an important concept in DDD. This kata is made both to learn value objects and to learn better ways of testing.

Write a probability value object. It should contain the following methods:
   Probability CombinedWith(Probability)
   Probability InverseOf()
   Probability Either(Probability)

if you forget your probability math:
   Either:P(A) + P(B) - P(A)P(B)
   CombinedWith: P(A)P(B)

gregoryyoung

OK so now you have implemented the kata. Your tests should look something like this:

We can say that the tests define the object "in a calculus of itself". They are not state based tests, they define how the behaviours of the object interact with each other.

To see the real value of this let's introduce some change ... I hear real system's do this occasionally. Because this is a high performance system decimal math is too slow. You now need to use floats instead. 

Need help on floating point math? Check out: http://www-users.math.umd.edu/~jkolesar/mait613/floating_point_math.pdf

You will need to use a non-exact equality... How will this change your code?