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Now, let’s imagine that we want to track the mouse position in another component as well. Can we reuse any of the code from our <App> ?

In the createClass paradigm, the problem of code reuse was solved using a technique called “mixins”. Let’s create a MouseMixin that anyone can use to track the mouse position.

Problem solved, right?! Now anyone can simply “mix in” MouseMixin to their component class to get the x and y of the mouse in this.state !

Then last year, arrived and ultimately the React team decided to move away from using createClass to use them instead. It was a wise decision. Who wants to maintain their own class model when JavaScript already has one built-in?

But there was a problem: ES6 classes don’t support mixins . Also, besides the fact they aren’t part of the ES6 class spec, mixins have other shortcomings too, many of which discussed at length in nike air max tavas white black digital print 1eSGn

ES6 classes don’t support mixins

To summarize, problems with mixins are:

ES6 classes Indirection Naming collisions

So instead of using mixins, many in the React community eventually settled on an alternative technique for code reuse known as higher-order components , or HOCs. In this paradigm, code is shared using a similar technique to discount nike free runs
; you start with the component that defines the bulk of the markup to be rendered and then wrap it in more components that contain the behavior you’d like to share. Instead of mixing in the behavior you need, you can just decorate your component! 😎


It was a good solution that solved the problem of code reuse elegantly in the brave new world of ES6 classes, and the community adopted it in droves.

At this point I’d like to stop and ask: what did we gain by moving to higher-order components? Did we solve any of the problems we had with mixins?

Let’s see:

Another problem that both mixins and HOCs share is that they use static composition instead of dynamic composition . Ask yourself: where is the composition happening in the HOC paradigm? Static composition happens once, when the component class is created (e.g. AppWithMouse in the previous example).

It is a known fact that the right styleguide can significantly increase development speed, debugging, and the implementation of new features in legacy code. Sadly, most CSS codebases are sometimes developed without any structure or naming conventions. This leads to an unmaintainable CSS codebase in the long term.

The BEM approach ensures that everyone who participates in the development of a website works with a single codebase and speaks the same language. Using proper naming will prepare you for the changes in design of the website.

Encapsulates a standalone entity that is meaningful on its own. While blocks can be nested and interact with each other, semantically they remain equal; there is no precedence or hierarchy. Holistic entities without DOM representation (such as controllers or models) can be blocks as well.

Block names may consist of Latin letters, digits, and dashes. To form a CSS class, add a short prefix for namespacing: .block

Any DOM node can be a block if it accepts a class name.

Parts of a block and have no standalone meaning. Any element is semantically tied to its block.

Element names may consist of Latin letters, digits, dashes and underscores. CSS class is formed as block name plus two underscores plus element name: .block__elem

Any DOM node within a block can be an element. Within a given block, all elements are semantically equal.

Flags on blocks or elements. Use them to change appearance, behavior or state.

Modifier names may consist of Latin letters, digits, dashes and underscores. CSS class is formed as block’s or element’s name plus two dashes: .block--mod or .block__elem--mod and .block--color-black with .block--color-red . Spaces in complicated modifiers are replaced by dash.

Modifier is an extra class name which you add to a block/element DOM node. Add modifier classes only to blocks/elements they modify, and keep the original class:

Use modifier class name as selector:

To alter elements based on a block-level modifier:

Element modifier:

Suppose you have block form with modifiers theme: "xmas" and simple: true and with elements input and submit , and element submit with its own modifier disabled: true for not submitting form while it is not filled:

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2 - 8 March - The IAATO community has a host of inspirational women who lead by example, are advocates for change and are instrumental in delivering our mission of safe, environmentally responsible polar travel. This week we celebrate Antarctic women, from scientists and educators to leaders and conservationists. Follow #polarwomenon Twitter and Instagram and read more about these amazing women as the week unfolds.

Why we need to make 2018 the year the world stops sucking

8 January - Amanda Lynnes, IAATO Head of Communications Environment, on black and pink nike air max 97 premium

December 1 - Happy Antarctica Day! To celebrate, IAATO has launched a free app called Polar Guide: Antarctica for staff guiding visitors in Antarctica that makes it quick and easy for users on-the-go in the field to access essential information without the need for a phone signal. Download now for and air jordan 1 nike id shoes XDmbP2ZO
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Happy Antarctica Day! Polar Guide: Antarctica

Executive Director, Damon Stanwell-Smith, also gives his thoughts on why we should all pause to reflect on the importance of Antarctica Day.

September 25-29 - IAATO is sharing tourism expertise and how we contribute to the knowledge of ice navigation at the International Ice Charting Working Group meeting in Hobart, Tasmania. The meeting brings together the polar maritime community, including satellite data providers, scientists and vessel operators. Such collaboration will maximize the safety of all mariners.

IAATO is sharing tourism expertise and how we contribute to the knowledge of ice navigation

September 25 -IAATO and Argentine authorities step up collaborative efforts to promote responsible tourism after a meeting last week in Ushuaia, Argentina. jordan air nike uk

promote responsible tourism

September 18 - Two poles, one mission: IAATO and her sister association in the Arctic, , are excited to announce the programme for their Polar Field Staff Conference in Iceland from 1-4 October 2017. nike roshe run venta mexico PNzqz2

Source: Natural Earth , 1:10m resolution.

An interesting challenge in cartography is getting data of the appropriate resolution. As Lewis Fry Richardson observed , the more precisely you measure the length of a coastline, the longer it appears; geographic shapes have infinite complexity. Digital displays, in contrast, are limited by pixels. Choosing too high a resolution increases download time and slows rendering, while too low a resolution elides important detail. This challenge is exacerbated by zoomable maps that desire multi-resolution geometry!

To simplify geometry to suit the displayed resolution, various line simplification algorithms exist. While Douglas–Peucker is the most well-known, Visvalingam’s algorithm may be more effective and has a remarkably intuitive explanation: it progressively removes points with the least-perceptible change. Amazingly, simplification often allows the elimination of 95% or more points while retaining sufficient detail for visualization. For example, the GeoJSON file used to draw the continental United States above can be reduced from 531KB to 27KB with only minor visual changes.

To determine which point removal incurs the smallest visible change, Visvalingam’s algorithm computes triangles formed by successive triplets of points along each line; the point with the smallest associated triangle is removed. After each removal, the area of neighboring triangles is recomputed and the process is repeated.

For example, consider this line of six points:

Ignoring the endpoints, the effective area of each point is determined by its associated triangle:

The purple triangle is the smallest, so the fifth point is removed first. This removal requires recomputing the area of the adjacent red triangle:

The green triangle is now the smallest, so the third point is removed, and the adjacent orange and red triangles are recomputed. This process continues until only the endpoints remain:

There is no guarantee that removing a point increases the area of the adjacent triangles; thus, the algorithm considers the effective area as the larger of the associated triangle and the previously-removed triangle.

One of the best features of Visvalingam’s algorithm is that the effective area can be subsequently stored in the geometry. For example, a point can have a z -coordinate that indicates its effective area, allowing efficient filtering for dynamic simplification even when the algorithm is run on the server. An example of this technique is shown at the top of the page, though more commonly simplification is done based on zoom level.

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