kumar-abhishek

Google is the ultimate tool if you want to learn something new, but this link-fest is made up of some of my favorite bookmarks on JavaScript; there's a lot of reading to do!

Also, feel free to email me at xbrxhxmxlrxjhi@gmail.com (replace x's with a's) if you have any questions.

JavaScript

• JavaScript Garden - explains a lot of quirky behaviors in JS
• Mozilla Docs - only real documentation for JS
  • String
• Number

kumar-abhishek

"""
This file contains code that, when run on Python 2.7.5 or earlier, creates
a string that should not exist: u'\Udeadbeef'. That's a single "character"
that's illegal in Python because it's outside the valid Unicode range.

It then uses it to crash various things in the Python standard library and
corrupt a database.

On Python 3... well, this file is full of syntax errors on Python 3. But
if you were to change the print statements and byte literals and stuff:

kumar-abhishek

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

kumar-abhishek

public void gameOfLife(int[][] board) {
    if(board == null || board.length == 0) return;
    int m = board.length, n = board[0].length;

    for(int i = 0; i < m; i++) {
        for(int j = 0; j < n; j++) {
            int lives = liveNeighbors(board, m, n, i, j);

            // In the beginning, every 2nd bit is 0;
            // So we only need to care about when the 2nd bit will become 1.

kumar-abhishek

Programming Achievements: How to Level Up as a Developer

This gist is part of a blog post. Check it out at:

http://jasonrudolph.com/blog/2011/08/09/programming-achievements-how-to-level-up-as-a-developer

kumar-abhishek

###Index

• Meta-Lists
• Graphics Programming
• Language Agnostic
• Android
• Autotools
• ASP.NET MVC
• Assembly Language
• Bash
• C / C++

kumar-abhishek

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

kumar-abhishek

class ChatApplication {
  login (username, password) {},
    
  logout (user) {},
    
  joinChatRoom(roomId, user) {}
    
  sendMessage(message, roomId, user) {}

  sendPrivateMessage(message, receiverId, user) {}

kumar-abhishek

X_train_000 = pd.read_csv('chorale_000.csv')
print(X_train_000.head())
>>> 
  note0  note1  note2  note3
0     74     70     65     58
1     74     70     65     58
2     74     70     65     58
3     74     70     65     58
4     75     70     58     55

kumar-abhishek

scaler = MinMaxScaler(feature_range=(0, 1))
dataXScaler = scaler.fit_transform(dataX)
dataYScaler = scaler.fit_transform(dataY)
print(dataXScaler[0:5])
print(dataYScaler[0:5])
>>>
[[0.44444444 0.77777778 1.         0.88235294]
 [0.44444444 0.77777778 1.         0.88235294]
 [0.44444444 0.77777778 1.         0.88235294]
 [0.44444444 0.77777778 1.         0.88235294]