justsml

#!/bin/bash

###### CREDIT: https://tembo.io/docs/getting-started/postgres_guides/how-to-load-census-data-with-ogr2ogr

TMPDIR="./tiger_tmp"
UNZIPTOOL=unzip
WGETTOOL=$(which wget)
OGR2OGR=$(which ogr2ogr)
export PGPORT=5432
export PGHOST="<your-host>"

justsml

Bash Shortcuts

Moving

command	description
ctrl + a	Goto BEGINNING of command line

justsml

Iterables, AsyncIterables, Observables, Oh My!

I know there is a lot of confusion around Observables, Iterables, AsyncIterables and AsyncObservables. Let's try to break this down and the reasons for each.

Pull versus Push Collections

When it comes to collections, you have two ways of thinking about collections, push versus pull. With pull, the consumer is in control of when you get the items, but with push, you get the values when the producer is ready.

Pull Based Collections

justsml

export type User = ReturnType<typeof verifyUser>;

// ^ Type defined for 'free'
// + Pro: Less wasted effort aligning types AND validation.
// + Pro: More 'honest', not obscured by layers, `any` or `as`
// - Con: Easy to accidentally change a public interface.
//      (Prefer explicit definitions at your library/module boundaries.)
export function verifyUser(data: { [key: string]: unknown; }) {
  if (!data || typeof data !== 'object')
    throw new Error(`User must be a valid object.`);

justsml

const DEFAULT_LOCALSTACK_EDGE_PORT = 4566;

/**
 * Get options for use in AWS client constructors.
 *
 * Configure the `AWS_ENDPOINT` environment variable to set an endpoint.
 *
 * ### Example
 *
 * To run tests w/ LocalStack: `AWS_ENDPOINT=http://127.0.0.1:4566 jest`

justsml

/**
 * A **Smarter** retry wrapper with currying!
 */
function retryCurry(fn, retriesLeft = 5) {
  const retryFn = (...args) => fn(...args)
    .catch(err => retriesLeft > 0
      ? retryFn(fn, retriesLeft - 1)
      : Promise.reject(err)
    })
  return retryFn

justsml

const checkForRedirect = (response) => {
  // Check for temporary redirect (307), or permanent (308)
  if (response.status === 307 || response.status === 308) {
    const location = response.headers.get('location')
    if (!location) {
      return Promise.reject(new Error('Invalid HTTP Redirect! No Location header.'));
    }
    // You can change the behavior here to any custom logic:
    //   e.g. open a "confirm" modal, log the redirect url, etc.
    return fetch(location)

justsml

{
	// See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
	// Extension identifier format: ${publisher}.${name}. Example: vscode.csharp

	// List of extensions which should be recommended for users of this workspace.
	"recommendations": [
		"streetsidesoftware.code-spell-checker",
		"kisstkondoros.vscode-codemetrics",
		"ms-azuretools.vscode-docker",
		"dbaeumer.vscode-eslint",

justsml

/**
 * `filteredFlagFactory` supports 3 states of a feature flag:
 * - True,
 * - False,
 * - and restricted by ID(s).
 *
 */
export function filteredFlagFactory(
  flagValue: string,
  defaultIdField = 'userId'

justsml

export const batchStream = (size: number) =>
  async function* batchStream<TStreamType>(stream: AsyncIterable<TStreamType>) {
    let buffer: TStreamType[] = [];
    for await (const chunk of stream) {
      buffer.push(chunk);
      if (buffer.length >= size) {
        yield buffer;
        buffer = [];
      }
    }