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

#!/bin/bash
#
# Set up OSX preferences
#
# Updated By: Dan Levy @justsml
#
# Inspired by: https://github.com/mathiasbynens/dotfiles/blob/master/.osx
###########################################
# CONFIG

justsml

Fetch API Examples

⚠️ 2019-2020: See more examples and updates on my article here!

https://danlevy.net/you-may-not-need-axios/

=====================================================

justsml

MacOS - Software Developer Environment Setup

Dan's collection of MacOS setup and configuration scripts, updated for 2022 🚀!

Table of Contents

Software & Apps

• Brew.sh
• Browsers

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

Add PageUp PageDown (Keyboard Shortcut Scrolling) to Sublime Text 3 (and 2)

• Save ScrollLinesFixedCommand.py to ~/Library/Application Support/Sublime Text 3/Packages/User/ folder
• Copy the suggested usage from sublime-keymap.json into your ~/Library/Application Support/Sublime Text 3/Packages/User/Default (OSX).sublime-keymap

Hey Sublime, why the hell this isn't an available keybinding by default? Seriously, I'm tired of looking up how to do this every so often. For most of my work I've switched to Visual Studio Code, the Open Source IDE from Microsoft (still sounds wierd)... But it's genuinely amazing.

justsml

#!/bin/bash

set -e
# REQUIRED ACTION: Configure your backup server vars  - see OVH Server Manager's "Backups" tab.
# BACKUP_HOST_PREFIX: use the prefix domain for the listed "Name" value on the "Backups" tab.
#     Example: With a 'Name' value `ftpback-bhs1-3.ip-111-222-333.net` you would need to set `BACKUP_HOST_PREFIX=ftpback-bhs1-3`

# Add something likethese to your ~/.bashrc  -  /etc/profile
#export OVH_SERVER_ID="ns5xxxxx.ip-x-x-x.net"
#export BACKUP_HOST_PREFIX="ftpback-bhs1-x"

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

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

/**
 * 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