A listener watches for an event to be fired. For example, a KeyListener waits for KeyEvents, a MessageListener waits for messages to arrive on a queue and so on. The handler is responsible for dealing with the event. Normally, listeners and handlers go hand-in-hand. For example, the KeyListener tells the ExitHandler that "the letter Q was pressed" and the handler performs logic such as cleaning up resources and exiting the application gracefully. Similary a ButtonClickListener would tell the same ExitHandler that the "Exit button was clicked". So, in this case you have two different events, two different listeners but a single handler.

The most basic difference is the association Listener is associated with Event Source (Ex: key board) Handler is associated with an Event (Ex: keydown)

For safety reasons, certain pumps and sprayers cannot be returned to the store if opened.

The notion that the state of our gut governs our state of mind dates back more than 100 years. Many 19th- and early 20th-century scientists believed that accumulating wastes in the colon triggered a state of “auto-intoxication,” whereby poisons emanating from the gut produced infections that were in turn linked with depression, anxiety and psychosis. Patients were treated with colonic purges and even bowel surgeries until these practices were dismissed as quackery.

passive: true instructs chrome that no body will call e.preventDefault() so chrome can optimized scrolling just because no body will call e.preventDefault and so there is no need to wait listeners...

As mentioned in #2937, this is the sort of thing that happens when you have two copies of Svelte's internal scheduler running. If you're importing the compiled version of an external Svelte component into another Svelte component, this is what you end up with. There's a svelte field in package.json that's respected by rollup-plugin-svelte and which is intended to point at the uncompiled Svelte source, so that the external component can be bundled together with the main app, without any duplicated internals.

positive feedback loops, in which a change in a given direction causes additional change in the same direction.For example, an increase in the concentration of a substance causes feedback that produces continued increases in concentration. negative feedback loops, in which a change in a given direction causes change in the opposite direction.For example, an increase in the concentration of a substance causes feedback that ultimately causes the concentration of the substance to decrease.

Linear mixed models are an extension of simple linear models to allow both fixed and random effects, and are particularly used when there is non independence in the data, such as arises from a hierarchical structure

So let's say we pull down evil/foo which is FROM ubuntu followed by RUN apt-get update except with a small surprise included in the image. Subsequent builds using those same commands will be compromised.

With the advent of JavaScript modules (import and export), it's possible to build libraries that are tree-shakeable. This means that a user of your library can import just the bits they need, without burdening their users with all the code you're not using.

this is the problem with that method.

The lockdown protesters have something important to say, but they need to say it safely.

From the viewpoint of the formal theory of sto- chastic processes, what we are looking at now is equivalent to a generalized "Polya urn scheme.

The advent of "touch" typing, a distinct advance over the four-finger hunt-and-peck method, came late in the 1880's and was critical, because this innovation was from its inception adapted to the Remington's QWERTY keyboard. Touch typing gave rise to three features of the evolving production system which were crucially important in causing QWERTY to become "locked in" as the dominant keyboard arrangement. These features were technical interrelatedness, econ- omies of scale, and quasi-irreversibility of investment. They constitute the basic in- gredients of what might be called QWERTY- nomics.

an effort to reduce the frequency of typebar clashes, there emerged a four-row, upper case keyboard approaching the mod- ern QWERTY standard

they have higher IQs and score better on other aptitude tests.

preferences of would-be criminals but also by the economic and social environment created by public policies, including expenditures on police, punishments for different crimes, and opportunities for em- ployment, schooling, and training program

actual discrimination in earnings and employment is deter- mined by tastes for discrimination, along with the degree of competi- tion in labor and product markets, the distribution of discrimination coefficients among members of the majority group, the access of mi- norities to education and training, the outcome of median voter and other voting mechanisms that determine whether legislation favors or is hostile to minorities, and other considerations

Actual discrimination in the marketplace against a minority group depends on the combined discrimination of employers, workers, con- sumers, schools, and governmen

Historical Institutionalists are first interested in explaining an outcome (say, for example, why France and Britain have pursued such different styles of industrial Policy (Hall 1986) or why some welfare states generate more popular support than others (Rothstein 1998) ) they THEN proceed to explore alternative explanations for the outcomes they observe.

I've done some extensive research and experimentation. Here are my results.

Decode of jq command:

e vision. All Western cultural narratives about objectivity are allegories of the ideologies governing the relations of what we call mind and body, distance and responsibility. Feminist objectivity is about limited location and situated knowledge, not about trans- cendence and splitting of subject and object. It allows us to become answerable for what we learn how to see.

thank you for the very detailed explanation of the issue

One of the significant differences between the two is that a call to a partially applied function returns the result right away, not another function down the currying chain; this distinction can be illustrated clearly for functions whose arity is greater than two.

As such, curry is more suitably defined as an operation which, in many theoretical cases, is often applied recursively, but which is theoretically indistinguishable (when considered as an operation) from a partial application.

Also, if you don't put that implementation of URLSearchParams in the global scope you're not using it as a polyfill but a ponyfill, and those are meant for your code, not for external dependencies.

Not all application state belongs inside your application's component hierarchy. Sometimes, you'll have values that need to be accessed by multiple unrelated components, or by a regular JavaScript module.

A store is simply an object with a subscribe method that allows interested parties to be notified whenever the store value changes. In App.svelte, count is a store, and we're setting count_value in the count.subscribe callback.

Just like elements can have children... <div> <p>I'm a child of the div</p> </div>...so can components. Before a component can accept children, though, it needs to know where to put them. We do this with the <slot> element.

andrewdeandrade commented on Jul 30, 2015

andrewdeandrade commented on Jul 31, 2015

I agree that "it feels gross" is a bad reason. "not paving a bad cowpath" is a much better reason.

virtual-dom is a collection of modules designed to provide a declarative way of representing the DOM for your app. So instead of updating the DOM when your application state changes, you simply create a virtual tree or VTree, which looks like the DOM state that you want. virtual-dom will then figure out how to make the DOM look like this efficiently without recreating all of the DOM nodes.

Escaping is a subset of encoding: You only encode certain characters by prefixing a special character instead of transferring (typically all or many) characters to another representation.

Escaping is a subset of encoding, where not all characters need to be encoded. Only some characters are encoded (by using an escape character).

A program somewhat controlling it's own flow. That's the key feature that makes a programming language Turing complete.

A programming language is Turing complete if you can implement any possible algorithm with it.

Moreover, React team even removed the “highlight updates” feature from dev tools because people used to obsessively haunt wasted renders with no reasoning behind it

More in-depth examples definitely sound like a good idea. I've seen cookbooks quite a few times already and they are always helpful.

To practice alternative media as critical media allows to question rulingideas and to contribute to the realization of suppressed societal alternatives. Such alternatives are based on the vision of atruly democratic society without oppression, in which grassroots participation is not restricted to interaction, but shapes allrealms of society.

The minimum requirement for speaking of an alternative medium is critical content and/orcomplex form.

Critical media are negative in so far as they relate phenomena to societal problems, to what societyhas failed to become and to tendencies that question and contradict the dominant and dominative mode of societal opera-tion and have the potential to become positive forces of change towards a better society. Critical media in one or the otherrespect take the standpoint of oppressed groups or exploited classes and make the judgement that structures of oppressionand exploitation benefit certain classes at the expense of others and hence should be radically transformed by social strug-gles. They aim at advancing social struggles that transform society towards the realization of co-operative and participatorypotentials.

alternative media at some levels can also employ capitalist tech-niques of media production in order to advance their political aims.

Realizing an ideal model of alternative media presupposes different societal conditions. This means that itrequires that people have enough time and skills for not only consuming, but also producing media content and that thenecessary technologies for media production are freely available.

‘Alternative med-ia” should be discussed in relation to the role they play in capitalism and therefore in the context of capitalism.

Giving ordinary peoplea voice by opening up access to media production is not enough for a truly democratic media system to emerge. Participationremains very limited if people can only talk but are not heard. Thus, the discussion on emancipatory media potentials alsohas to consider structural inequalities as a central feature of capitalism.

Public visibility is still stratified through powerrelations.

alternative media are not located outside the capitalist system and therefore are dependent on financial resources for theproduction and distribution of their products, which can hardly be obtained without making use of commercial mechanismsof financing.

reporting about topics, which capitalist mass media tend to neglect and by criticizing structures ofdomination and oppression. Such alternative media need to gain public attentio

lack of re-sources

remain margina

Any variable referenced on the lines marked with $: is marked as a dependency of the derived variable.

It's possible to run a function whenever some reactive state changes using the useEffect hook. In the example we log the length of the todoList whenever it changes. The first argument to useEffect is the function we want to run, and the second is a list of reactive values to track - whenever one of these values changes the effect will run again.

setContext must be called synchronously during component initialization. That is, from the root of the <script> tag

using modulesOnly behaves exactly as expected when it warns you that the listed npm libraries do not use the ES6 format and are in fact ignored. This option is meant as a way to determine if you still have commonjs libraries in your dependencies that require special treatment via rollup-plugin-commonjs. Your code will probably not work since the listed dependencies will be missing. You should remove modulesOnly and instead add rollup-plugin-commonjs.

The difference between default and named affects how other people can consume your bundle. If you use default, a CommonJS user could do this, for example:

In other words for those tools, you cannot create a package interface where const lib = require("your-lib") yields the same as import lib from "your-lib". With named export mode however, const {lib} = require("your-lib") will be equivalent to import {lib} from "your-lib".

globals are assumed to have their field value on the window object and can be referenced inside the bundle by their field name globals: { name: 'Value', }, assumes that some other script tag or whatever establishes window.Value and the emitted umd bundle for example, calls the factory like factory(global.Value). So globals is just stuff to bring into the factory on the globals object. It doesn't even make it "global" inside the bundle. Basically, the resolver does not check the globals object during the loading process. The resolver needs to be told how to link these globals and that's what the external option is for. external: ['name'], Then you can reference it like import myName from 'name'; myName();

we've learned why you might want to use external but not globals: libraries. We've started to factor some of our client-side JS as libraries to share between projects. These libraries import $ from 'jquery'. However they don't want to presume how that import might be "fulfilled". In most projects it's fulfilled from a global i.e. a script loaded from a CDN. However in one project it's fulfilled from a local copy of jQuery for reasons I won't get into. So when these libraries bundle themselves for distribution, as ES6 modules, they mark 'jquery' as an external and not as a global. This leaves the import statements in the bundle. (Warning: Don't bundle as an IIFE or UMD, or Rollup will guess at fulfilling the import from a global, as @Rich-Harris mentions above.)

Then it would tell NPM that “if a package lists me as a dependency, then assume that package also has a dependency on PackageB”.

To make this “if you install me, you better also install X, Y, and Z!” problem easier, peerDependencies was introduced.

This is a little confusing to describe. An example:

this explanation is not gonna be succinct, but I couldn't express this clearly, sorry!

Think of useRef as a useState that does not trigger a re-rendering of our component.

Explanation

In depth

The Analytics JavaScript Tag When a JavaScript-enabled web browser loads a page with the Analytics tag (ga.js or analytics.js), it does two things asynchronously: load and process the Analytics function queue and request the Analytics JavaScript. The function queue is a JavaScript array where the different Analytics configuration and collection functions are pushed. These functions, which are set by the site owner when implementing Analytics can include functions like specifying the Analytics account number and actually sending page view data to the Analytics Collection Network for processing. When the Analytics JavaScript runs a function from the function queue that triggers data to be sent to the Analytics Collection Network (this function is typically ga('send', 'pageview') in the analytics.js JavaScript library and _trackPageview in the ga.js library), it sends the data as URL parameters attached to an HTTP request for http://www.google-analytics.com/_utm.gif (for ga.js) and http://www.google-analytics.com/collect (for analytics.js). If the anonymization function has been called prior to the page tracking function, an additional parameter is added to the pixel request. The IP anonymization parameter looks like this: &aip=1 The Analytics Collection Network The Analytics Collection Network is the set of servers that provide two main services: the serving of ga.js and analytics.js (the Analytics JavaScript) and the collection of data sent via requests for _utm.gif and /collect. When a request for ga.js, analytics.js, _utm.gif, or /collect arrives, it includes additional information in the HTTP request header (i.e. the type of browser being used) and the TCP/IP header (i.e. the IP address of the requester). As soon as a request for _utm.gif arrives, it is held in memory for anonymization. If the &aip=1 parameter is found in the request URL (as it would have been placed by the Analytics JavaScript after processing the anonymization function in ga.js or analytics.js ), then the last octet of the user IP address is set to zero while still in memory. For example, an IP address of 12.214.31.144 would be changed to 12.214.31.0. (If the IP address is an IPv6 address, the last 80 of the 128 bits are set to zero.) Only after this anonymization process is the request written to disk for processing. If the IP anonymization method is used, then at no time is the full IP address written to disk as all anonymization happens in memory nearly instantaneously after the request has been received.

Cross-channel conversion paths See the big picture. Understand the value of upper funnel ad clicks in multi-click, cross-channel journeys.

If a user clicks on that button, the onclick script will not execute. This is because the script did not immediately execute and code not interpreted until the click event occurs is not considered part of the content script, so the CSP of the page (not of the extension) restricts its behavior. And since that CSP does not specify unsafe-inline, the inline event handler is blocked.

This topic is not a support question

whose personal data you collect and process as “controller” (that is the word that GDPR uses for whoever determines the purposes and means of the processing of personal data).

If you’re selling products and keep record of users’ choices for marketing purposes, dividing them into meaningful categories, such as by age, gender, geographical origin etc., you’re profiling them.

English tends to build new compound nouns by simply writing them as separate words with a blank. Once the compound is established (and the original parts somewhat "forgotten"), it's often written as one word or hyphenated. (Examples: shoelaces, aircraft...)

A website (also written as web site) is a collection of web pages and related content that is identified by a common domain name and published on at least one web server

In math, idempotence describes only unary functions that you can call on their own output. Math-idempotence is, “If you take the absolute value of a number, and then you take the absolute value of that, the result doesn’t change on the second (or subsequent) operations.” Math.abs is math-idempotent. Math-idempotence only applies to functions of one parameter where the parameter type and return type are the same. Not so useful in programming.

Since the authenticity token is stored in the session, the client cannot know its value. This prevents people from submitting forms to a Rails app without viewing the form within that app itself. Imagine that you are using service A, you logged into the service and everything is ok. Now imagine that you went to use service B, and you saw a picture you like, and pressed on the picture to view a larger size of it. Now, if some evil code was there at service B, it might send a request to service A (which you are logged into), and ask to delete your account, by sending a request to http://serviceA.com/close_account. This is what is known as CSRF (Cross Site Request Forgery). If service A is using authenticity tokens, this attack vector is no longer applicable, since the request from service B would not contain the correct authenticity token, and will not be allowed to continue.

The process of collecting and storing user consent from a technical perspective

First-party cookies are the lifeblood of every website, enabling businesses to remember key pieces of information about users and to collect analytics data. Third-party cookies are the bread and butter of AdTech, allowing publishers to monetize their websites, and brands to run advertising and marketing campaigns.

They are in place to prevent brute forcing a password. If you had to complete these every time you login, a person has to be there to answer it. This makes it so you can’t leave a guessing software to break your password. So, in short, it's for your account’s safety.

disinformation is a subset of misinformation (that is, all disinformation is misinformation

The visitors of that blog post will get third-party non-essential cookies unless they previously set their browser to block cookies.

the feature was dropped to “lack of use.”

It's a good practice to create respond_to_missing? if you are overriding method_missing. That way, the class will tell you the method you are calling exists, even though it's not explicitly declared.

Europium is used in the printing of euro banknotes. It glows red under UV light, and forgeries can be detected by the lack of this red glow.

Low-energy light bulbs contain a little europium to give a more natural light, by balancing the blue (cold) light with a little red (warm) light.

So if you create one backup per night, for example with a cronjob, then this retention policy gives you 512 days of retention. This is useful but this can require to much disk space, that is why we have included a non-linear distribution policy. In short, we keep only the oldest backup in the range 257-512, and also in the range 129-256, and so on. This exponential distribution in time of the backups retains more backups in the short term and less in the long term; it keeps only 10 or 11 backups but spans a retention of 257-512 days.

Neutrino only babel-compiles first party source (the JSX -> JS transformation is handled by a babel plugin). It does this because even when using the module entry in package.json, it's expected that the provided file (and it's imports) still be JS and not in some other format - ie: the only difference from the content in main should be that it can use modules syntax (that is import and export rather than require etc).

A UMD build will let people use your module via a global variable by dropping it into a <script> tag - this makes it easier to try without any build tooling in an HTML file, and in tools like JS Bin and CodePen.

Oh, is it like Object.assign() then? Almost like Object.assign({}, divElement, {newProp: 'newProp'})?

React.cloneElement() allows us to clone a runtime element (not the class), and apply an enhancement to it.

The terms “controlled” and “uncontrolled” usually refer to form inputs, but they can also describe where any component’s data lives. Data passed in as props can be thought of as controlled (because the parent component controls that data). Data that exists only in internal state can be thought of as uncontrolled (because the parent can’t directly change it).

well explained article

Rack middleware is more than "a way to filter a request and response" - it's an implementation of the pipeline design pattern for web servers using Rack. It very cleanly separates out the different stages of processing a request - separation of concerns being a key goal of all well designed software products.

It would be safer to just register the JS entrypoints and automatically add CSS packs if there are any required by that JS. Webpacker does this already. Check your webpacker.yml and ensure that extract_css is false. This will prevent webpacker from separating the 2 files.

You probably have extract_css: true in your webpacker.yml. This removes import '../scss/index'; and generates the equivalent style sheet. You do need to add stylesheet_pack_tag yourself.

When you do import '../src/application.css', you're telling webpack include application.css in the build. This does not mean it's going to be compiled into your javascript, only that webpack now knows that you want to compile this file. How that file compilation is handled is depending on how your loaders (css-loader, sass-loader, file-loader, etc.. ) are configured.

P can't be assigned {}, since the Generic Type P can be a more defined (or restricted) type.

React is hanging on to a reference to previous functions because memoization typically means that we keep copies of old values to return in the event we get the same dependencies as given previously

The useRef creates an "instance variable" in functional component.

business incubator

Reagan years

Lithium-ion batteries are key components for most consumer electronics, from cellphones and laptops to electric cars.

Due to its electrical conductivity, copper is used in electronics, cars, and wires. This makes copper critical for highly developed countries.

Cobalt's primary ores are cobaltite (CoAsS) and erythrite (Co3(AsO4)2). Cobalt is usually recovered as a byproduct of mining and refining nickel, silver, lead, copper and iron.

When we burn these fossil fuels, the carbon combines with oxygen to make carbon dioxide. This extra carbon dioxide (and other GHGs like methane) traps more and more heat in our atmosphere.

Theorem 4.3.

zN(c;Kc)

gcinti N(cint;Kcint)for eachi;j