Jason Thorpe jdthorpe

The standard typings for react-dnd suck. In particular

They ignore the fact that thre props recieved by the wrapped component are a union of the props passed in to the react-dnd HOC and props collected by react-dnd collectors
Items are assigned type Object
DropResults are assigned the type Object

These types are a work and progress, which means they suck too. They just suck a little less than the standard typings

The Problem

You're using the awesome JSDOM package to process a few hundred html files and your process crashes with an error like this:

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory

If you're sure your code it not accidentally holding on to a reference to (nodes from) prior window objects, then the most likely cause of the apparent memory leak is that

When you've got a data.frame in R and want to write it to csv and then import it into a Python Pandas instance, lazy code like this will fail to parse your string and date fields:

<some_file.R>
write.csv(my_data_frame, "my_data.csv" row.names=FALSE)

Introduction to Hierarchical Casting with `dhcast()`

First, the h in dhcast is for hierarchy, and is useful when you need to (A) cast (go from long to wide data) and where (B) casting should observe a given variable hierarchy, and (optionally) aggregate your data(summarize related records in the long dataset) at the same time.

Lets say, for example, that we want to predict some time varying attribute of a grocery store customers based their produce purchases. Furthermore, we want to

Getting data from Azure SQL Data Warehouse into R

TL;DR

This note describes the process of automating the execution of queries against an Azure SQL Data Warehouse using Active Directory Integrated Authentication to produce (possibly multiple) CSV files

	// this requires `namedExports` to work with rollup:
	import {join } from "lodash";

	// this works with both webpack and rollup and yields a smaller package:
	// import join from "lodash/join";

	// this works everythere, of course:
	// import _ from "lodash"

	// this works everwhere because it's an external module and isn't bundled by webpack or rollup:

	{
	"requires": true,
	"lockfileVersion": 1,
	"dependencies": {
	"@types/bluebird": {
	"version": "3.5.23",
	"resolved": "https://registry.npmjs.org/@types/bluebird/-/bluebird-3.5.23.tgz",
	"integrity": "sha512-xlehmc6RT+wMEhy9ZqeqmozVmuFzTfsaV2NlfFFWhigy7n6sjMbUUB+SZBWK78lZgWHA4DBAdQvQxUvcB8N1tw=="
	},
	"@types/fs-extra": {


	declare module "kld-intersections" {

	class Shape {}

	export class Point2D {
	constructor(x:number,y:number)
	}

	class Bezier2 extends Shape {

	{
	"name": "svg.js-test",
	"version": "1.0.0",
	"lockfileVersion": 1,
	"requires": true,
	"dependencies": {
	"acorn": {
	"version": "5.7.1",
	"resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.1.tgz",
	"integrity": "sha512-d+nbxBUGKg7Arpsvbnlq61mc12ek3EY8EQldM3GPAhWJ1UVxC6TDGbIvUMNU6obBX3i1+ptCIzV4vq0gFPEGVQ=="

Jason Thorpe jdthorpe

The Problem

Introduction to Hierarchical Casting with dhcast()

Getting data from Azure SQL Data Warehouse into R

TL;DR

Automation with SqlCmd: Which SQLCMD to use?

Introduction to Hierarchical Casting with `dhcast()`