gregorynicholas

Net APY Calculation

1. Convert all supplied and borrowed asset amounts to a single asset (like USD or ETH).
2. Calculate the sum of (suppliedAmount * supplyApyAsDecimal - borrowedAmount * borrowApyAsDecimal) for all underlying assets.
3. If the calculated sum from the previous step is >0 then Net APY = 100 * (sum / totalSuppliedValue). If the calculation from the previous step is <0 then Net APY = 100 * (sum / totalBorrowedValue). If the calculation from the previous step is 0 then Net APY = 0.

Example

Net APY:

• -7.29%

gregorynicholas

// Based on https://github.com/ethereum/EIPs/blob/master/assets/eip-712/Example.js

const ethers = require('ethers');

function abiRawEncode(encTypes, encValues) {
  const hexStr = ethers.utils.defaultAbiCoder.encode(encTypes, encValues);
  return Buffer.from(hexStr.slice(2, hexStr.length), 'hex');
}

function keccak256(arg) {

gregorynicholas

Enable macOS Server Performance Mode

Performance mode changes the system parameters of your Mac. These changes take better advantage of your hardware for demanding server applications.

A Mac with macOS Server that needs to run high-performance services can turn on performance mode to dedicate additional system resources for server applications. Note, however, that performance mode can be enabled even without macOS Server being installed to achieve similar benifits for other high-performance services.

sudo nvram boot-args="serverperfmode=1 $(nvram boot-args 2>/dev/null | cut -f 2-)"
sudo reboot

Reference: https://support.apple.com/en-us/HT202528.

gregorynicholas

sysctl kern.maxfiles
#kern.maxfiles: 12288
sysctl kern.maxfilesperproc
#kern.maxfilesperproc: 10240
sudo sysctl -w kern.maxfiles=1048600
#kern.maxfiles: 12288 -> 1048600
sudo sysctl -w kern.maxfilesperproc=1048576
#kern.maxfilesperproc: 10240 -> 1048576

sudo sysctl -w net.inet.tcp.rfc1323=1

gregorynicholas

#!/bin/bash

####################################
# Config
##################

HTTPROBE_CONCURRENCY=100
HTTPROBE_TIMEOUT=3000

DIRSEARCH_THREADS=50

gregorynicholas

Cyclic Rotation - Array

An array A consisting of N integers is given. Rotation of the array means that each element is shifted right by one index, and the last element of the array is moved to the first place. For example, the rotation of array A = [3, 8, 9, 7, 6] is [6, 3, 8, 9, 7] (elements are shifted right by one index and 6 is moved to the first place).

The goal is to rotate array A K times; that is, each element of A will be shifted to the right K times.

Write a function:

function solution($A, $K);

gregorynicholas

// Weekly Employee Income Withholding Calculator by GitHub#Liath
// Based on IRS Circular E - http://www.irs.gov/pub/irs-pdf/p15.pdf
// Per the "Percentage Method"
var  w = {
    s : { // Single
        0    : { p : 0, s : 0 },
        44   : { p: 0.1, s: 0 },
        222  : { p: 0.15, s: 17.8 },
        764  : { p: 0.25, s: 99.1 },
        1789 : { p: 0.28, s: 355.35 },

gregorynicholas

#!/usr/bin/env bash
set -e

# See also: https://github.com/frost-nzcr4/find_forks (same thing but in python)

origin_url="$(git remote show origin | grep 'Fetch URL:' | sed 's+.*: ++')"

full_repo_name="$(echo "$origin_url" | sed 's+.*github.com/++')"

forks_url="https://api.github.com/repos/${full_repo_name}/forks"

gregorynicholas

Tech Cooperative Resources

A collection of random articles, videos and other links to stuff, re-posted from our slack channel and other places.

Business

Interviewing

• Guide: Use structured interviewing https://rework.withgoogle.com/guides/hiring-use-structured-interviewing/steps/introduction/

• Five Reasons Why You Should Hire an Old Programmer

gregorynicholas

# (C) Mathieu Blondel, November 2013
# License: BSD 3 clause

import numpy as np


def ranking_precision_score(y_true, y_score, k=10):
    """Precision at rank k

    Parameters