rmela

/*
 *
 *   Return SQLite3 query results as a Nodejs stream, sensitive to backpressure.
 *
 *   Assumes a foo.db file with a lot of rows - I used 1000 with a number & a string
 */

const stream = require('stream');
const sqlite = require('sqlite3');
class DBStream extends stream.Readable {

rmela

/*
 *
 * Wikipedia:
 *
 *    The final digit of a Universal Product Code is a check digit computed as follows:
 *
 *       1) Take digits up to but not including the check digit.
 *       2) Sum the digits in the odd-numbered positions (first, third, fifth, etc.) together and multiply by three.
 *       3) Add the sum of digits in the even-numbered positions (0th, 2nd, 4th, 6th, etc.) to the result.
 *       4) Take result modulo 10

rmela

def inrange( maxx, maxy ):
    def func( point ):
        x,y = point
        return x >= 0 and x <= maxx and y >= 0 and y <= maxy 
    return func

class Game:

    def __init__(self):
        self.board = [

rmela

#
# Coding challenge that took me well over an hour for a one-hour limi.
# I started by overbuilding.   Lesson learned is - do minimum viable
# for interview coding challenges!
#
# Sigh.
#
# Challenge is to parse a string representing an arithmetic expression
# and evaluate it without using eval()
#

rmela

Coding challenge.

Create a DataCapture class that queries statistics about an input stream of numbers.

Assume that the input stream consists of positive integers in the range 0 to 1000.

Class must implement the following methods:

    add(n) - add an input element to collection in O(1) time
    build() - create summary information on the collection in O(log(n)) time

rmela

#
#  I was given about 10 minutes to figure out an exercise that
#  boiled down to merging named tuples
# 
#  Weird thing to expect someone to know.  Certainly anyone who knows this
#  off the top of their head knows a lot about Python.   But not everyone
#  good developer will know this little corner of Python.
#
#  It took me some time inspecting tuples to come up with this approach, slowed
#  by my discomfort with relying on single-underscore members of library objects

rmela

const express = require('express')
const app = express()

const HOST = 'localhost'
const PORT = 8000

function hello( req, res ) {
    const msg = `Use curl http://${HOST}:${PORT}/upload --upload-file <somefile>`
    res.send(msg)
    res.end()

rmela

import React, { useState } from 'react'
import './App.css'

function Cell( props ) {
  const [ state, setState ] = useState( props.alive )
  return <td class={ props.alive ? 'alive' : 'dead' }>r{props.row}c{props.col}</td>
}

function Table( props ) {

rmela

!/bin/bash

#
# Put this script into ~/.githooks/pre-push and make it executable.
# Then run git config -add core.githooks ~/.gitconfig
#
# You could also put it into .git/hooks for a particular repo 
# and skip the git config step
#
  

rmela

let tree = {
   '0': {
       '1': {
          '3': null,
          '4': null },
       '2': {
          '5': null,
          '6': null }
   }
}