janetlee

function triangle(num) {
  var result = [[1], [1,1]];

  for (var j = 0; j < num; j++) {
    // console.log('previousArr', result[result.length-1]);
    var previousArr = result[result.length-1];  
    var tempArr = [];
  
    // for each element of previous array
    for (var i = 0; i < previousArr.length ; i++) {

janetlee

Installing Cassandra on Mac OS X

Install Homebrew

Homebrew is a great little package manager for OS X. If you haven't already, installing it is pretty easy:

ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

janetlee

/**
  * Write a function that, given two objects, returns whether or not the two
  * are deeply equivalent--meaning the structure of the two objects is the
  * same, and so is the structure of each of their corresponding descendants.
  *
  * Examples:
  *
  * deepEquals({a:1, b: {c:3}},{a:1, b: {c:3}}); // true
  * deepEquals({a:1, b: {c:5}},{a:1, b: {c:6}}); // false
  *

janetlee

sudo apt update
sudo apt dist-upgrade -y
sudo apt install -y vim-tiny openjdk-8-jre-headless
curl https://www.apache.org/dist/cassandra/KEYS | sudo apt-key add -
sudo apt-key adv --keyserver pool.sks-keyservers.net --recv-key A278B781FE4B2BDA
echo "deb http://www.apache.org/dist/cassandra/debian 22x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
echo "deb-src http://www.apache.org/dist/cassandra/debian 22x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
gpg --keyserver pgp.mit.edu --recv-keys F758CE318D77295D
gpg --export --armor F758CE318D77295D | sudo apt-key add -
gpg --keyserver pgp.mit.edu --recv-keys 2B5C1B00

janetlee

Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
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 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

janetlee

SET FOREIGN_KEY_CHECKS = 0; 
TRUNCATE table $table_name; 
SET FOREIGN_KEY_CHECKS = 1;

janetlee

function isLeft(char) {
 return (char === "(" || char === "[" || char === "{") ? true : false;
}

function isValidPair(str) {
  str.split("");
  var stack =[];
  var pairs = {")": "(", "]": "[", "}": "{"};
  
  if (str.length <= 1) {

janetlee

* Tic Tac Toe
* Connect Four
* Blackjack
* Priority Queueing/Dequeing
* Calculate State and Federal taxes (Marginal brackets make it harder than you think)
* Create-React-App commenting tool
* Basic Keyword search via API call
* Build a calculator with UI
* Merge Sort
* Calculate the angle between two clock hands if given the time

janetlee

Learning Data Structures and Algorithms: https://player.oreilly.com/videos/9781771373470

janetlee

git fetch origin -- to get all the remote branches
git pull origin develop -- to ensure your development branch is fully up to date. The response should be up to date, but you never know

git checkout release/X.XX -- to choose release/X.XX as your base branch
git pull – to update the release branch again because you never know what your colleagues are doing

git checkout -b X.XX-hotfix/JIRA-9999 -- to cut a new branch off release/X.XX base branch
git cherry-pick SHA1 -- cherry pick SHA in order to apply them. This is the first SHA to apply.
git cherry-pick SHA2 -- cherry pick the second SHA to apply
git push origin X.XX-hotfix/JIRA-9999 -- push cherry picked commits