J. B. Rainsberger jbrains

A professional 5-pin bowler who helps programmers work with less stress. #Lightweight #xplives

jbrains / 1-Before.elm

Created August 1, 2017 22:51

How do I move the composition into the pipeline operating on Maybes?

	changePlayerName : PlayerModel -> String -> ScorekeeperModel -> ScorekeeperModel
	changePlayerName playerToChange newName scorekeeperModel =
	let
	{ players } =
	scorekeeperModel
	in
	{ scorekeeperModel
	\| players =
	Exts.List.mergeBy
	(.id)

jbrains / 1-GraftNextCommitIfAny.sh

Last active July 23, 2017 17:56

Extract subproject from git repository by grafting commits onto the corresponding files

	# CONTRACT
	# SOURCE_SUBPRPOJECT_ROOT points to the "same" directory tree
	# as TARGET_PROJECT_ROOT. We're extracting the directory tree
	# at SOURCE_SUBPROJECT_ROOT into TARGET_PROJECT_ROOT.
	#
	# There must be a single, linear history in the SOURCE repository.

	# Graft the current commit into the target
	pushd "$SOURCE_SUBPROJECT_ROOT"
	commit_comment="$(git log -1 --pretty=%B)"

jbrains / 1-Before.elm

Last active July 23, 2017 15:46

Removing duplication with Elm record syntax

	playerDetailsViewModel : (PlayerId -> Int) -> PlayerModel -> PlayerDetailsViewModel
	playerDetailsViewModel playerPointsScored playerModel =
	PlayerDetailsViewModel
	playerModel.id
	playerModel.name
	(playerPointsScored playerModel.id)

jbrains / 1-before.elm

Created July 2, 2017 16:22

Example: the value of describing a function with a comment

	divFor : (a -> List (Attribute msg)) -> (a -> List (Html msg)) -> a -> Html msg
	divFor cssStylesFor bodyFor blob =
	-- Given functions that generate attributes and HTML elements for a thing,
	-- wrap it in a div.
	div
	(cssStylesFor blob)
	(bodyFor blob)

jbrains / 1-before-the-long-way.elm

Last active July 2, 2017 02:00

REVIEW: creating optional HTML from a Result in Elm

	-- This becomes the typical pop-up error message at the top of an HTML page
	failureView : Result String Int -> List (Html Update)
	failureView possibleNumericInput =
	case possibleNumericInput of
	Err message ->
	[ text message ]

	Ok _ ->
	[]

jbrains / drum-kit.html

Last active April 2, 2017 21:06

Finding functional/reusable bits in a small amount of Javascript. Especially trying to push details up the call stack.

	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<title>JS Drum Kit</title>
	<link rel="stylesheet" href="style.css">
	</head>

	<body>

jbrains / DispatchingEffectsFromOptionValue.java

Created December 3, 2016 18:05

PLEASE tell me that there's a better way in Java to write this

	// findPrice : String -> Option<Price>
	// Option comes from Atlassian's fugue library https://docs.atlassian.com/fugue/4.3.0/fugue/apidocs/index.html
	// I want the equivalent of
	// case (maybePrice) {
	// none => display.displayProductNotFoundMessage(barcode)
	// some(price) => display.displayPrice(price)
	// }

	catalog.findPrice(barcode)
	.<Runnable>fold(

jbrains / PointOfSaleTerminal.java

Last active November 28, 2016 21:20 — forked from CoryFoy/sample.rb

TDD no Expectations

	package ca.jbrains.pos;

	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.net.InetAddress;
	import java.util.HashMap;

	public class PointOfSaleTerminal {
	public static void main(String[] args) throws IOException {
	final InputStreamReader commandSource = new InputStreamReader(System.in);

jbrains / Before.java

Created November 27, 2016 21:02

How do I extract map(trim), then filter(!empty) into a method while keeping the pipeline style?

	new StreamTextCommands()
	.streamCommandsFrom(new InputStreamReader(System.in))
	.map(String::trim)
	.filter((command) -> !command.isEmpty())
	.map(commandText -> sellOneItemController.onBarcode(commandText))
	.map(CommandResponse::render)
	.forEach(System.out::println);

jbrains / FindPricePossiblyReturningNull.java

Created November 27, 2016 20:11

I'm not convinced by this particular usage of Optional...

	public CommandResponse onBarcode(String barcode) {
	Price price = catalog.findPrice(barcode);
	return price == null
	? new ProductNotFoundMessage(barcode)
	: new ProductFoundMessage(price);
	}