piperchester

def find_max_subarray(arr):
  min_sum = max_sum = 0
  for running_sum in itertools.accumulate(arr):
     min_sum = min(min_sum, running_sum)
     max_sum = max(max_sum, running_sum - min_sum)
  return max_sum

piperchester

#!/bin/bash

set -eu

# This should likely be the "baseline" of what's currently been recorded
# from master
export PREVIOUS_SHA=$(git rev-parse origin/master)

# This should likely be the newly introduced commit
export CURRENT_SHA="$(git rev-parse HEAD)"

piperchester

Recursion examples

def fn1(n):
  """Linear."""
  return 1 if n <= 0 else 1 + fn1(n-1)

def fn2(n): """Linear."""

piperchester

# matrix 
matrix = [ 
 [1,2,3],
 [4,5,6]
]

piperchester

// treeshaking - remove all nodes at height 3 if they're leaves

      *
    / | \
   *  *  *
        / \
       *  *
        /  \
 * *

piperchester

The Ultimate Unit Testing Cheat-sheet

For Mocha, Chai and Sinon

using mocha/chai/sinon for node.js unit-tests? check out my utility: mocha-stirrer to easily reuse test components and mock require dependencies

---

• Sinon Chai
• Chai
• Sinon

piperchester

{
  "name": "piper.im",
  "version": "2.0.0",
  "description": "Personal website of Piper Chester",
  "main": "index.html",
  "dependencies": {
    "react": "^16.2.0",
    "react-dom": "^16.2.0",
    "react-scripts": "1.0.17",    
    "http-server": "^0.10.0",

piperchester

{
 dependencies: {
    prettier,
    husky,
    lint-staged,
   }
}

piperchester

// hoisting sample


'use strict';

console.log(bar);  // undefined
var bar = 'bar';
console.log(bar);  // 'bar'

// function decls hoisted as well (not func expressions though)

piperchester

uptime
dmesg | tail
vmstat 1
mpstat -P ALL 1
pidstat 1
iostat -xz 1
free -m
sar -n DEV 1
sar -n TCP,ETCP 1
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