staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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ohanhi

Learning FP the hard way: Experiences on the Elm language

by Ossi Hanhinen, @ohanhi

with the support of Futurice 💚.

Licensed under CC BY 4.0.

Editorial note

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

emeeks

The earlier example of this brushable radial chart led to some feedback to make the filtering better. I introduced a #circularBrush.filter(array,accessor) that takes an array of data and and accessor for that data and returns to you the data that falls into the area of the brush. The functionality of this chart is no different than the other, but if you take a look at the code, it's much more efficient.

pdamoc

import Html exposing (..)
import Keyboard
import Window exposing (Size)
import AnimationFrame

import Task 
import Html.App as App

import Collage exposing (..)
import Element exposing (..)

davidwatkins73

/*
 * Available context bindings:
 *   COLUMNS     List<DataColumn>
 *   ROWS        Iterable<DataRow>
 *   OUT         { append() }
 *   FORMATTER   { format(row, col); formatValue(Object, col) }
 *   TRANSPOSED  Boolean
 * plus ALL_COLUMNS, TABLE, DIALECT
 *
 * where:

davidwatkins73

*$CapsLock::
Send {LControl down}
Sleep 300
Send {LControl up}

davidwatkins73

// ->|--|<-   (Narrow)
javascript:w = document._w || 1100; w = w - 100; document.body.style.width = w + "px"; document._w = w;

// <-|--|->   (Widen)
javascript:w = document._w || 900; w = w + 100; document.body.style.width = w + "px"; document._w = w;