OliverJAsh

Option vs non-Option

	Option<T>	non-Option (T | undefined)
accessing property	userOption.map(user => user.age)	userNullish?.age
calling a method	userOption.map(user => user.fn())	userNullish?.fn()
providing fallback	ageOption.getOrElse(0)	ageNullish ?? 0
filter	ageOption.filter(checkIsOddNumber)	`ageNull

Herteby

module ID exposing (ID(..), decodeFromString, decoder, encode, encodeAsString, fromInt, toInt, toString)

import Json.Decode as Decode exposing (Decoder)
import Json.Encode as Encode exposing (Value)


{-| This type ensures you get a type error if you for example accidentally pass a UserId in place of a CompanyId
-}
type ID phantom
    = ID Int

roine

From 0.19 Elm introduced 4 ways to boot an app:

1. sandbox (no outside interaction)
2. element (simple outside interaction - side effect, flags, subscriptions)
3. document (same as above but with title tag control)
4. application (whole SPA features)

rauschma

Strings

String.prototype.*

None of the string methods modify this – they always return fresh strings.

• charAt(pos: number): string ^ES1

  Returns the character at index pos, as a string (JavaScript does not have a datatype for characters). str[i] is equivalent to str.charAt(i) and more concise (caveat: may not work on old engines).

rauschma

This content moved here: https://exploringjs.com/impatient-js/ch_arrays.html#quickref-arrays

kobake

#!/bin/bash

if [ $# -ne 1 ]; then
  echo "Usage: git-commit-size.sh <commit hash>" 1>&2
  exit 1
fi

HASH=$1

ITEM_LIST="`git diff-tree -r -c -M -C --no-commit-id $HASH`"

superbob

# Path to your oh-my-zsh configuration.
ZSH=$HOME/.oh-my-zsh

# Set name of the theme to load.
# Look in ~/.oh-my-zsh/themes/
# Optionally, if you set this to "random", it'll load a random theme each
# time that oh-my-zsh is loaded.
ZSH_THEME="powerlevel9k/powerlevel9k"
DEFAULT_USER="..."
export LS_COLORS="di=34;40:ln=36;40:so=35;40:pi=33;40:ex=32;40:bd=1;33;40:cd=1;33;40:su=0;41:sg=0;43:tw=0;42:ow=34;40:"

VictorTaelin

async/await is just the do-notation of the Promise monad

CertSimple just wrote a blog post arguing ES2017's async/await was the best thing to happen with JavaScript. I wholeheartedly agree.

In short, one of the (few?) good things about JavaScript used to be how well it handled asynchronous requests. This was mostly thanks to its Scheme-inherited implementation of functions and closures. That, though, was also one of its worst faults, because it led to the "callback hell", an seemingly unavoidable pattern that made highly asynchronous JS code almost unreadable. Many solutions attempted to solve that, but most failed. Promises almost did it, but failed too. Finally, async/await is here and, combined with Promises, it solves the problem for good. On this post, I'll explain why that is the case and trace a link between promises, async/await, the do-notation and monads.

First, let's illustrate the 3 styles by implementing

parmentf

Inspired by dannyfritz/commit-message-emoji

See also gitmoji.

Commit type	Emoji
Initial commit	🎉 :tada:
Version tag	🔖 :bookmark:
New feature	✨ :sparkles:
Bugfix	🐛 :bug:

afternoon

find app/src -name "*.js" -exec sh -c 'mv "$0" "${0%.js}.ts"' {} \;