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Deconstructing the React Component (Functional Programming with React)

Deconstructing the React Component — Jack Hsu

echojs.com ↑1 ↓0 5min/read Read at jaysoo.ca Share on Facebook, Twitter or Google+

Read at jaysoo.ca Keywords: view, map, span, computation, const, x, props, concat, color, function

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A functional approach to building React applications.

Photo by Mark Sebastian

In this three-part series, I want to take a functional approach to building React applications.

There will be mathematical theory sprinkled throughout the series, and hopefully by the end of it you will pick up some useful techniques!

Series contents:

Part 1 - Deconstructing the React Component
Part 2 - The Reader monad and read-only context
Part 3 - Functional state management with Reducer

Functional programming – category theory in particular – teaches us a lot about program construction. Much of the tools that functional programmers reach for are very generalized, and widely applicable to various domains. It is this

... read the whole story at jaysoo.ca.

The simplest way to design drop quotes with CSS? Grid Drop Quotes. via @meyerweb

Eric's Archived Thoughts: Grid Drop Quotes, Revisited

16 2min/read Read at meyerweb.com Share on Facebook, Twitter or Google+

Read at meyerweb.com Keywords: grid, blockquote, rows, row, drop quote, s, height, span, auto, philippe

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In last week’s Grid-Powered Drop Quotes, I overlooked a potential problem with the styles I created. Fortunately, Philippe Wittenbergh caught it and pointed it out, and we both hit on the same solution.

The problem-in-waiting is that the big drop quote will force a gap between the first child element of the blockquote and the second, if the first child is short. You can see this in the demo below (external version also available), where I made the first paragraph only a few words long. If you select the “Borders” option, you can see the problem more clearly.

The solution is to have the drop quote span multiple rows. The original CSS went something like this, simplified for the sake of clarity:

... read the whole story at meyerweb.com.

CSS Grid Cheat Sheet

21 1min/read Read at alialaa.github.io Share on Facebook, Twitter or Google+

Read at alialaa.github.io Keywords: line number span, auto line number, info_outline auto line, number span grid, start end center, auto start end, info_outline auto start, span grid row, start info_outline auto, end center stretch

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close

grid-column-start info_outline

Auto Line Number Span

grid-column-end info_outline

Auto Line Number Span

grid-row-start info_outline

Auto Line Number Span

grid-row-end info_outline

Auto Line Number Span

justify-self info_outline auto start end center stretch

align-self info_outline auto start end center stretch

... read the whole story at alialaa.github.io.

Stateful functional React components without runtime overhead

GitHub - roman01la/babel-plugin-stateful-functional-react-components: Stateful functional React components without runtime overhead

echojs.com ↑2 ↓0 1min/read Read at github.com Share on Facebook, Twitter or Google+

Read at github.com Keywords: val, div, state, functional react components, setstate val val, stateful functional react, button div div, span button onclick, val span button, span val span

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✨ Stateful functional React components without runtime overhead (inspired by ClojureScript) ✨

Compiles stateful functional React components syntax into ES2015 classes

WARNING: This plugin is experimental. If you are interested in taking this further, please open an issue or submit a PR with improvements.

Why?

Because functional components are concise and it's annoying to write ES2015 classes when all you need is local state.

Advantages

No runtime overhead
No dependencies that adds additional KB's to your bundle

Example

Input

const Counter = ({ text }, { val } = { val: 0 }, setState) => ( <div> <h1>{text}

... read the whole story at github.com.

Deep dive CSS: font metrics, line-height and vertical-align

1 5min/read Read at iamvdo.me Share on Facebook, Twitter or Google+

Read at iamvdo.me Keywords: height, font, line height, line box, span, content area, font size, p, var, vertical align

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Line-height and vertical-align are simple CSS properties. So simple that most of us are convinced to fully understand how they work and how to use them. But it’s not. They really are complex, maybe the hardest ones, as they have a major role in the creation of one of the less-known feature of CSS: inline formatting context.

For example, line-height can be set as a length or a unitless value , but the default is normal. OK, but what normal is? We often read that it is (or should be) 1, or maybe 1.2, even the CSS spec is unclear on that point. We know that unitless line-height is font-size relative, but the problem is that

... read the whole story at iamvdo.me.

The broken promise of Web Components

frontendfront.com 4min/read Read at dmitriid.com Share on Facebook, Twitter or Google+

Read at dmitriid.com Keywords: s, web components, dom, react, javascript, p, text, polymer, span, component

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Disclaimer: I talk a lot about React here, but you can substitute your favorite library: Inferno, Preact, Vue, snabbdom, virtual-dom (or non-js libraries and frameworks like Elm, Om, etc.). Similarly, replace Polymer with Vaadin, or X-Tag, or…

Also, read Rob Dodson’s excellent response to this article: https://robdodson.me/regarding-the-broken-promise-of-web-components/

Brief, incomplete, and mostly incorrect history of Web ComponentsAncient times

By 2011 Internet had grown. It had Facebooks and Gmails, and Twitters, and Asanas, and Google Docs, and countless other online things that could no longer be called sites, or Single Page Applications. They were, for all intents and puposes, applications. As simple as that.

... read the whole story at dmitriid.com.

Pretty cool interactive solar system with Three.js

Three js - Interactive solar systemcssAudio - ActiveCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - Activehtmlicon-personicon-teamoctocatspinnerstartv

33 4min/read Read at codepen.io Share on Facebook, Twitter or Google+

Read at codepen.io Keywords: var, ease quad easeinout, planetviewed, add, span, delay, quad easeinout tweenmax, position, mesh, camera

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  var container, stats; var camera, controls, scene, renderer; var info; var cube; var sphereTab = []; var objects = []; var parent2; var sun; var sun2; var sun3; var currentcolor; var cubeNul; var earthPivot; var earthPivot3; var mesh; var planetViewed = 0; init(); animate(); $(window).on('load', function() { TweenMax.to($('#welcome'), 1, { css: { opacity: 1 }, ease: Quad.easeInOut, }); TweenMax.to($('#social'), 0.5, { css: { bottom:'20px' },delay:0.5, ease: Quad.easeInOut, }); TweenMax.to($('#border'), 0.5, { css: { height: '200px', }, delay: 0.5, ease: Quad.easeInOut, }); }); function hideWelcome() { TweenMax.to($('#welcome'), 0.5, { css: { opacity: 0 }, ease: Quad.easeInOut }); TweenMax.to($('#welcome'), 0.5, { css: { display: 'none' }, delay: 1, ease: Quad.easeInOut }); } function init() { camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 1000); camera.position.z = 68; controls = new THREE.OrbitControls(camera); controls.maxDistance = 300; controls.minDistance = 30; scene = new THREE.Scene(); var geoSphere = new THREE.SphereGeometry(Math.random() * 1, 20, 20); for (var i = 0; i < 500; i++) { // randRadius = Math.random()*30+10; lumiereS = new THREE.MeshPhongMaterial({ emissive: '#fff' }); sphereTab.push(new THREE.Mesh(new THREE.SphereGeometry(Math.random() * 1, 20, 20), lumiereS)); } var posX = -3000; var posY = -3000; for (var i = 0; i < sphereTab.length; i++) { sphereTab[i].position.set(Math.random() * 600 - 300, Math.random() * 600 - 300, Math.random() * 600 - 300); scene.add(sphereTab[i]); } //////Sun//////// var pinkMat = new THREE.MeshPhongMaterial({ color: 0xF66120, emissive: 0xF66120, specular: 0xFFED22, shininess: 10, shading: THREE.FlatShading, transparent: 1, opacity: 1 }); var pinkMat2 = new THREE.MeshPhongMaterial({ color: 0xF66120, emissive: 0xF66120, specular: 0xFFED22, shininess: 10, shading: THREE.FlatShading, transparent: 1, opacity: 1 }); var geometry = new THREE.IcosahedronGeometry(3, 1); var geometry2 = new THREE.IcosahedronGeometry(2.5, 1); var geometry4 = new THREE.IcosahedronGeometry(3, 1); // material var material = new THREE.MeshPhongMaterial({ color: 0xffc12d, emissive: 0xffc12d, shading: THREE.FlatShading }); var material2 = new THREE.MeshPhongMaterial({ color: 0x26D7E7, emissive: 0x26D7E7, shading: THREE.FlatShading }); var material4 = new THREE.MeshPhongMaterial({ color: 0xacacac, emissive: 0xacacac, shading: THREE.FlatShading }); sun = new THREE.Mesh(new THREE.IcosahedronGeometry(10, 1), pinkMat); scene.add(sun); objects.push(sun); sun2 = new THREE.Mesh(new THREE.IcosahedronGeometry(10, 1), pinkMat2); sun2.rotation.x = 1; scene.add(sun2); objects.push(sun2); sun3 = new THREE.Mesh(new THREE.IcosahedronGeometry(10, 1), pinkMat2); sun3.rotation.x = 1; scene.add(sun2); objects.push(sun3); earthPivot3 = new THREE.Object3D(); sun.add(earthPivot3); var radius = 16; var tubeRadius = 0.03; var radialSegments = 8 * 10; var tubularSegments = 6 * 15; var arc = Math.PI * 3; var geometry3 = new THREE.TorusGeometry(radius, tubeRadius, radialSegments, tubularSegments, arc); var material3 = new THREE.MeshLambertMaterial({ color: 0xffffff, emissive: 0xffffff, shading: THREE.FlatShading, }); mesh = new THREE.Mesh(geometry3, material3); earthPivot3.add(mesh); /// planet blue /// earthPivot = new THREE.Object3D(); sun.add(earthPivot); var earth = new THREE.Mesh(geometry, material); earth.position.x = 15; earthPivot.add(earth); objects.push(earth); ///// planet green //// earthPivot2 = new THREE.Object3D(); sun.add(earthPivot2); var earth2 = new THREE.Mesh(geometry2, material2); earth2.position.x = 20; earthPivot2.add(earth2); objects.push(earth2); ////planet violet /// earthPivot4 = new THREE.Object3D(); sun.add(earthPivot4); var earth3 = new THREE.Mesh(geometry4, material4); earth3.position.x = 26; earthPivot4.add(earth3); objects.push(earth3); // lights light = new THREE.DirectionalLight(0x4f4f4f); light.position.set(4, 4, 4); scene.add(light); light = new THREE.DirectionalLight(0x4f4f4f); light.position.set(-4, -4, -4); scene.add(light); //render renderer = new THREE.WebGLRenderer({ antialias: true }); renderer.sortObjects = false; renderer.setClearColor(0x131A3D, 1); renderer.setSize(window.innerWidth, window.innerHeight); stats = new Stats(); container = document.getElementById('container'); container.appendChild(renderer.domElement); window.addEventListener('resize', onWindowResize, false); info = document.getElementById('contentTitle'); subtitle = document.getElementById('subtitle'); description = document.getElementById('description') var univers = document.getElementById('univers'); } function onWindowResize() { camera.aspect = window.innerWidth / window.innerHeight; camera.updateProjectionMatrix(); renderer.setSize(window.innerWidth, window.innerHeight); render(); } function setFromCamera(raycaster, coords, origin) { raycaster.ray.origin.copy(camera.position); raycaster.ray.direction.set(coords.x, coords.y, 0.5).unproject(camera).sub(camera.position).normalize(); } function onMouseDown(event) { raycaster = new THREE.Raycaster(); mouse = new THREE.Vector2(); mouse.x = (event.clientX / renderer.domElement.width) * 2 - 1; mouse.y = -(event.clientY / renderer.domElement.height) * 2 + 1; setFromCamera(raycaster, mouse, camera); var intersects = raycaster.intersectObjects(objects); currentcolor = intersects[0].object.material.color.getHex(); if (intersects.length > 0) { console.log(currentcolor); switch (intersects[0].object.geometry.type) { case 'IcosahedronGeometry': if (currentcolor == 0xF66120) { if (planetViewed == 0) { hideWelcome(); planetViewed = 1; TweenMax.from($('#content'), 0.5, { css: { left: '-500px' }, delay:0.5, ease: Quad.easeInOut }); TweenMax.from($('#border'), 0.5, { css: { height: '0px' }, delay: 1, ease: Quad.easeInOut, }); info.innerHTML = " <span>Sunny</span> Icosahedron,"; description.innerHTML = "Alive for <span>204895</span> years<br/><br/><div>Click on the other planets to learn more ...<div>"; } if (planetViewed == 2 || planetViewed==3 || planetViewed==4) { planetViewed = 1; TweenMax.from($('#content'), 0.5, { css: { left: '-500px' }, ease: Quad.easeInOut }); TweenMax.to($('#border'), 0.2, { css: { height: '200px' },delay:1, ease: Quad.easeInOut, }); TweenMax.from($('#border'), 0.5, { css: { height: '0px' }, delay: 0.5, ease: Quad.easeInOut, }); info.innerHTML = " <span>Sunny</span> Icosahedron,"; description.innerHTML = "Alive for <span>204895</span> years<br/><br/><div>Click on the other planets to learn more ...<div>"; } } if (currentcolor == 0x26D7E7) { if (planetViewed == 1 || planetViewed==3 || planetViewed==4) { planetViewed = 2; info.innerHTML = " <span id='couleur'>Blue</span> Icosahedron,"; document.getElementById('couleur').style.color="#26d7e7"; description.innerHTML = "<br/><br/><div>Click on the other planets to learn more ...<div>"; TweenMax.from($('#content'), 0.5, { css: { left: '-500px' }, ease: Quad.easeInOut }); TweenMax.to($('#border'), 0.2, { css: { height: '200px' },delay:1, ease: Quad.easeInOut, }); TweenMax.from($('#border'), 0.5, { css: { height: '0px' }, delay: 0.5, ease: Quad.easeInOut, }); } } if (currentcolor == 0xffc12d) { if (planetViewed == 1 || planetViewed==2 || planetViewed==4) { planetViewed = 3; info.innerHTML = '<span id="couleur">Yellow</span> Icosahedron'; description.innerHTML = "<br/><br/><div>Click on the other planets to learn more ...<div>"; document.getElementById('couleur').style.color="#ffc12d"; TweenMax.from($('#content'), 0.5, { css: { left: '-500px' }, ease: Quad.easeInOut }); TweenMax.to($('#border'), 0.2, { css: { height: '200px' },delay:1, ease: Quad.easeInOut, }); TweenMax.from($('#border'), 0.5, { css: { height: '0px' }, delay: 0.5, ease: Quad.easeInOut, }); } } if (currentcolor == 0xacacac) { if (planetViewed == 1 || planetViewed==2 || planetViewed==3) { planetViewed = 4; info.innerHTML = '<span id="couleur">Grey</span> Icosahedron'; document.getElementById('couleur').style.color="#acacac"; description.innerHTML = "<br/><br/><div>Click on the other planets to learn more ...<div>"; TweenMax.from($('#content'), 0.5, { css: { left: '-500px' }, ease: Quad.easeInOut }); TweenMax.to($('#border'), 0.1, { css: { height: '200px' },delay:1, ease: Quad.easeInOut, }); TweenMax.from($('#border'), 0.5, { css: { height: '0px' }, delay: 0.5, ease: Quad.easeInOut, }); } } break; } } console.log('Down'); } document.addEventListener('mousedown', onMouseDown, false); function animate() { ; var timer = 0.00001 * Date.now(); for (var i = 0, il = sphereTab.length; i < il; i++) { var sfere = sphereTab[i]; sfere.position.x = 400 * Math.sin(timer + i); // sfere.position.z= 500 * Math.sin( timer + i * 1.1 ); sfere.position.z = 400 * Math.sin(timer + i * 1.1); } sun.rotation.x += 0.008; sun2.rotation.y += 0.008; sun3.rotation.z += 0.008; earthPivot.rotation.z += 0.006; earthPivot2.rotation.z += 0.01; earthPivot3.rotation.y += 0.007; earthPivot4.rotation.z+=0.008; requestAnimationFrame(animate); controls.update(); render(); } function render() { // } renderer.render(scene, camera) }

... read the whole story at codepen.io.

Deep dive CSS: font metrics, line-height and vertical-align

27 5min/read Read at iamvdo.me Share on Facebook, Twitter or Google+

Read at iamvdo.me Keywords: height, font, line height, line box, span, content area, font size, p, var, vertical align

Social activity:
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Line-height and vertical-align are simple CSS properties. So simple that most of us are convinced to fully understand how they work and how to use them. But it’s not. They really are complex, maybe the hardest ones, as they have a major role in the creation of one of the less-known feature of CSS: inline formatting context.

For example, line-height can be set as a length or a unitless value , but the default is normal. OK, but what normal is? We often read that it is (or should be) 1, or maybe 1.2, even the CSS spec is unclear on that point. We know that unitless line-height is font-size relative, but the problem is that

... read the whole story at iamvdo.me.