How to Make a React Progressive Web Application (PWA)Eugene VolkovFrontend DeveloperKate KikidzhanCloud & SaaS Product ResearcherReactJavaScriptPWAHomeBlogDevelopmentHow to Make a React Progressive Web Application (PWA)Oct 7, 202021 min readThe early bird catches the worm. But the situation was not so favourable back in 2007 when Steve Jobs proposed the idea of web applications to be the model for iPhone Apps. Back then, the tech community was not yet ready to bring a huge interest in web apps. But since 2015, tech giants like Google and Microsoft have been preparing the tech ground for progressive web apps (or simply – PWAs). And now, PWA became a must-have technology for both giant corporations and small startups. Twitter, Starbucks, Google, and Aliexpress use progressive web apps to boost their online presence. At Codica, we have been helping our customers to develop their businesses by building robust PWA for our customers since 2015. That is why we have created this comprehensive guide on how to create a PWA with React. Also, you will see the most prominent progressive web app examples.

Using Boolean Search on LinkedInLast updated: July 6, 2018You can run a Boolean search on LinkedIn by combining keywords with operators like AND, NOT, and OR during your search.Here are some ways to use Boolean logic and construct your searches: Quoted searches: For an exact phrase, enclose the phrase in quotation marks. For example, type "product manager". You can also use quotation marks if you want to find someone with a multi-word title. LinkedIn search only supports standard, straight quotation marks ("). Other software or websites may use special symbols that our system does not recognize. Curly quotation marks (“), also known as smart quotes or typographer's quotes, aren't supported. In order to optimize overall site performance, stop words such as "by", "in", "with", etc. aren't used. NOT searches: Type the word NOT (capital letters) immediately before a search term to exclude it from your search results. This typically limits your search results. For example, "programmer NOT manager". OR searches: Type the word OR (capital letters) to see results that include one or more items in a list. This typically broadens your search results. For example, "sales OR marketing OR advertising”. AND searches: AND searches: Type the word AND (capital letters) to see results that include all items in a list. This typically limits your search results. For example, "accountant AND finance AND CPA".. Note: You don't need to use AND. If your search has two or more terms, you'll automatically see results that include all of them. Parenthetical searches - To do a complex search, you can combine terms using parentheses. For example, to find people who have "VP" in their profiles, but exclude "assistant to VP" or SVPs, type VP NOT (assistant OR SVP). When handling searches, the overall order to precedence is: Quotes [""] Parentheses [()] NOT AND OR Important: The + and - operators are not officially supported by LinkedIn. Using AND in place of + and NOT in place of - makes a query much easier to read and guarantees that we'll handle the search correctly. When using NOT, AND, or OR operators, you must type them in uppercase letters. We don't support wildcard "*" searches. Boolean search will work in the keyword field in Recruiter and Linkedin.com, and will work in the Company, title, and keyword field in Sales Navigator.

But if you're working on a bigger project, with multiple packages and a complex dependency tree, you might want to combine npm with a tool like Lerna.

This is why for a recent Angular+Rails project we chose to use a testing stack from the backend technology’s ecosystem for e2e testing.

We used testing tools that were in the same ecosystem as our backend technology stack for primrily three reasons: We owned both ends of the stack Team experience Interacting with the database

We chose to define the frontend in one technology stack (Angular+TypeScript/JavaScript) and the backend in another (Ruby+Ruby on Rails), but both came together to fulfill a singular product vision.

I’m going to add the API Server as an actor to my first test sequence to give some granularity as to what I’m actually testing.

For features like websocket interactions, a single full-stack smoke test is almost essential to confirm that things are going as planned, even if the individual parts of the interaction are also covered by unit tests.

How to test at the correct level?

As many things in life, deciding what to test at each level of testing is a trade-off:

First of all, I would start off presenting yourself: Dear XYZ support team I am the web developer in charge of example.com website. By presenting you this way, you are establishing the frame to treat you, hinting that you should be presupposed to be somewhat proficient, so they could choose to answer in a more technical detail.

Feel free to hint, brag, or both! The best CS reps should easily take a hint from clear language and a signature like John Appleseed, JavaScript/Ruby Developer, but any will catch on with a simple line like "I know what I'm doing, so I'd appreciate an extra-technical explanation!"

Hey, I'm a PhD in [field] and do [whatever] professionally. Before calling you, I've narrowed down the problem to [something on their end], so that's what needs to be addressed. If I could speak to an engineer about [specific problem], that'd be great; but if we've gotta walk through the script, let's just knock it out quickly. If they end up requiring the script, then the best way to use your expertise is to run through it quickly. Keep the chit-chat to a minimum and just do the stuff efficiently. If they start describing how to perform some step, you might interrupt them with, "Got it, just a sec.", then let them know once you're ready for the next step.

However, what speaks against just straight up telling them that you're working as [Insert title of your position] and you know what you're talking about?

OP is referring to letting people know they can speak like proper adults when talking about technical terms, without going through the usual nanny-like discourse that tech support has to provide to non-techies. For instance, it happened to me with Amazon support. The speaker told me exactly where to touch in order to clear the cache of the Android Amazon App Store. Given that I work as an app developer the guy could have just said "please clear the cache". No need to go through "tap here, then here, now you should see this, tap that"...

I have tried different tactics of showing the tech support that I am proficient in their field of work (I work as a web developer). Specifically: using accurate terms and technologies to show my knowledge of them and telling the support that I am the "administrator" of the website in question.

How to let tech support subtly know that I am proficient without showing off?

How to Take Smart Notes

Of course you must not use plain-text passwords and place them directly into scripts. You even must not use telnet protocol at all. And avoid ftp, too. I needn’t say why you should use ssh, instead, need I? And you also must not plug your fingers into 220 voltage AC-output. Telnet was chosen for examples as less harmless alternative, because it’s getting rare in real life, but it can show all basic functions of expect-like tools, even abilities to send passwords. BUT, you can use “Expect and Co” to do other things, I just show the direction.

Essentially after any edit of any js file if we reload /qunit it takes us about 10 seconds for the page to render.

I was debugging our painfully slow reload times in Discourse when running qunit.

but I still have no idea if I'm writing this new file correctly.

I'm kinda stuck at the moment, going around in circles. Everything is really heavily coupled. I would like to get to the point where no load is called from within processors, but i'm not sure if that's possible. Currently the API and the caching strategies are fighting me at every step of the way. I have a branch where i'm hacking through some refactoring, no light at the end of the tunnel yet though :(

it's super hard to test master because i have no idea which gems need to be updated. is there a guide on how to take a rails 4.2 project to master sprockets without everything mysteriously exploding? ill try to make a repro case but its hard to tell where to even start

I don't myself understand what's going on, it clearly has something to do with source maps, but may also have to do with other sprockets changes.

I don't really understand what's going on. Clearly source maps have something to do with it -- a source map feature that doesn't handle SCSS very well, apparently.

Is there a PR to... something? sassc-rails? That would make the patch not necessary? (I don't know if there's any good way to monkey-patch that in, I think you have to fork? So some change seems required...) Should the defaults be different somehow? This is very difficult to figure out.

If you plan on using a gamepad with big picture mode I made a config that works perfectly so check it out.

always use real <label for="correct_input"> elements. Just that alone is a UX consideration all too many forms fail on

Fibar bi jàngal na taawan bu góor ni ñuy dagge reeni aloom.

Hey, that’s is an imaginary complication of our example - please don’t do this with every condition you have in your app.

For branching out a separate path in an activity, use the Path() macro. It’s a convenient, simple way to declare alternative routes

step :decide_type, Output(Activity::Left, :credit_card) => Track(:with_credit_card)

# Create the track, which would automatically create an implicit End with the same id.
Track(:with_credit_card) do
    step :authorize
    step :charge
end

class Example::ValidationErrorTrack < Trailblazer::Activity::Railway
  step :validate_model, Output(:failure) => Track(:validation_error)
  step :save,           Output(:failure) => Track(:validation_error)

  # Can't use fail here or the magnetic_to won't work and  Track(:validation_error) won't work
  step :log_validation_error, magnetic_to: :validation_error,
    Output(:success) => End(:validation_error), 
    Output(:failure) => End(:validation_error) 
end

puts Trailblazer::Developer.render o
Reloading...

#<Start/:default>
 {Trailblazer::Activity::Right} => #<Trailblazer::Activity::TaskBuilder::Task user_proc=validate_model>
#<Trailblazer::Activity::TaskBuilder::Task user_proc=validate_model>
 {Trailblazer::Activity::Left} => #<Trailblazer::Activity::TaskBuilder::Task user_proc=log_validation_error>
 {Trailblazer::Activity::Right} => #<Trailblazer::Activity::TaskBuilder::Task user_proc=save>
#<Trailblazer::Activity::TaskBuilder::Task user_proc=save>
 {Trailblazer::Activity::Left} => #<Trailblazer::Activity::TaskBuilder::Task user_proc=log_validation_error>
 {Trailblazer::Activity::Right} => #<End/:success>
#<Trailblazer::Activity::TaskBuilder::Task user_proc=log_validation_error>
 {Trailblazer::Activity::Left} => #<End/:validation_error>
 {Trailblazer::Activity::Right} => #<End/:validation_error>
#<End/:success>

#<End/:validation_error>

#<End/:failure>

class Example::ValidationErrorTrack::VPathHelper1 < Trailblazer::Activity::Railway
   validation_error_path = Path(end_id: "End.validation_error", end_task: End(:validation_error)) do
    step :log_validation_error
  end
  step :validate_model, Output(:failure) => validation_error_path
  step :save,           Output(:failure) => validation_error_path
end

o=Example::ValidationErrorTrack::VPathHelper1; puts Trailblazer::Developer.render o
Reloading...

#<Start/:default>
 {Trailblazer::Activity::Right} => #<Trailblazer::Activity::TaskBuilder::Task user_proc=validate_model>
#<Trailblazer::Activity::TaskBuilder::Task user_proc=validate_model>
 {Trailblazer::Activity::Left} => #<Trailblazer::Activity::TaskBuilder::Task user_proc=log_validation_error>
 {Trailblazer::Activity::Right} => #<Trailblazer::Activity::TaskBuilder::Task user_proc=save>
#<Trailblazer::Activity::TaskBuilder::Task user_proc=log_validation_error>
 {Trailblazer::Activity::Right} => #<End/:validation_error>
#<Trailblazer::Activity::TaskBuilder::Task user_proc=save>
 {Trailblazer::Activity::Left} => #<Trailblazer::Activity::TaskBuilder::Task user_proc=log_validation_error>
 {Trailblazer::Activity::Right} => #<End/:success>
#<End/:success>

#<End/:validation_error>

#<End/:failure>

step :direct_debit

how to track on-call coverage

How do you know if source maps are working correctly? Try adding a syntax error to one of your assets and use the console to debug. Does it show the correct file and source location? Or does it reference the top level application.js file?

found that using only the Pascal-provided control structures, the correct solution was given by only 20% of the subjects, while no subject wrote incorrect code for this problem if allowed to write a return from the middle of a loop.

But why do we return 0? Why not 1? Why not None? And while None in most cases is as bad (or even worse) than the exceptions, turns out we should heavily rely on business logic and use-cases of this function.

While Trailblazer offers you abstraction layers for all aspects of Ruby On Rails, it does not missionize you. Wherever you want, you may fall back to the "Rails Way" with fat models, monolithic controllers, global helpers, etc. This is not a bad thing, but allows you to step-wise introduce Trailblazer's encapsulation in your app without having to rewrite it.

This is a breaking change so it'll have to go into a major release. I was working on a v4 release but it's too much. I think I'm going to pair it back and we can add this to the new v4. When I have that ready, I'll rebase the merge onto that branch.

I don't think seeing it in Rails PRs naturally means we should do it blankly. Put it another way, what's the justification in those PRs for doing it?

Space: Suppose we had infinite memory, then cache all the data; but we don't so we have to decide what to cache that is meaningful to have the cache implemented (is a ??K cache size enough for your use case? Should you add more?) - It's the balance with the resources available.

Time: Suppose all your data was immutable, then cache all the data indefinitely. But this isn't always to case so you have to figure out what works for the given scenario (A person's mailing address doesn't change often, but their GPS position does).

So the hard and unsolvable problem becomes: how up-to-date do you really need to be?

After considering the value we place, and the tradeoffs we make, when it comes to knowing anything of significance, I think it becomes much easier to understand why cache invalidation is one of the hard problems in computer science

the most productive environment possible for people that use their computer to create.What is a productive environment?How do you measure productivity in an operating system environment?How do you compare YOUR distribution to other distributions when it comes to productivity?Is the way in which 'people that use their computer to create' (creators) the same across all professions and activities?Does a photographer have the same requirements for a productive environment as a software engineer?Why do you think your distribution will be the best for delivering a productive environment than any other Linux distribution?

systemd has such huge documentation. systemd.unit Did you try searching for explanation yourself? What did you find?

http://letmegooglethat.com/?q=How+to+change+the+default+search+engine+in+chromium&l=1

How should this be manually tested?

It's not impossible, but it's not likely I would accept someone I haven't worked with IRL or know on a personal level. That's because I want some form of creative control over the direction and I want to maintain the existing code style. If I know you I'm more likely to know that this will keep working the way I want it to.

Show me good PRs, bug triaging, documentation fixes, whatever and you're a candidate if you ask for it.

If you want a reference to the global object that works in any context, you can read this from a directly-called function. const global = (function() {return this})();. This evaluates to window in the browser, self in a service worker and global in nodejs.

Test plan You need a large NPM package in a private org on the npmjs.org registry. 10MB download size is ideal.

How many times have you heard the cliché, for example, read between the lines? It turns out, the key to reading between the lines is actually to write between the lines. Once you start, you'll discover a whole new reading experience, elevated from that of a one-sided lecture to a two-sided conversation.

How to Create a Messaging Application from Scratch

All standard UI events are forwarded.

class: '' - A CSS class string.

Just coming here to voice my agreement that these warnings are annoying and exist in other libraries as well. For me this happened with svelma. I didn't write the library code, so I don't have complete control over it even though I agree there is an argument to be had around whether I should be notified anyway. In either case, these warnings should be easily disabled since libraries don't always get updated over night.

Maybe it's also a bug because every warning should be ignorable? Not sure.

I would like the compiler to add a property like canIgnore: false to the warning, if the warning cannot be disabled.

When you’re implementing a bad plan yourself, instead of having a mentor bail you out by fixing it, a few really useful things happen:You learn many more details about why it was a bad idea. If someone else tells you your plan is bad, they’ll probably list the top two or three reasons. By actually following through, you’ll also get to learn reasons 4–1,217.You spend about 100x more time thinking about how you’ll avoid ever making that type of mistake again, i.e., digesting what you’ve learned and integrating it into your overall decision-making.By watching my mistakes and successes play out well or badly over the course of months, I was able to build much more detailed, precise models about what does and doesn’t matter for long-term codebase health. Eventually, that let me make architectural decisions with much more conviction.

But what should you write about? Simply ask yourself, What's bothering you most right now? Write a post where you work through that—and get to a conclusion. This is how I start every time. Writing is therapy that you publish for the world to learn from.

First, choose your topicThe best topic to write about is the one you can’t not write about. It’s the idea bouncing around your head that urges you to get to the bottom of it.You can trigger this state of mind with a two-part trick. First, choose an objective for your article:Open people’s eyes by proving the status quo wrong.Articulate something everyone’s thinking about but no one is saying. Cut through the noise.Identify key trends on a topic. Use them to predict the future.Contribute original insights through research and experimentation.Distill an overwhelming topic into something approachable. (This guide.)Share a solution to a tough problem.Tell a suspenseful and emotional story that imparts a lesson.Now pair that objective with a motivation:Does writing this article get something off your chest?Does it help reason through a nagging, unsolved problem you have?Does it persuade others to do something you believe is important?Do you obsess over the topic and want others to geek out over it too?That’s all that's needed: Pair an objective with a motivation. Now you have something to talk about.

If you have a better/simpler/"more official" solution, I'd still love to see it!

The idea of the hermeneutic circle is to envision a whole in terms how the parts interact with each other, and how they interact with the whole. That may sound a little bit out there, so let’s have a look at a concrete example.

How to Win at College: Surprising Secrets for Success from the Country's Top Students Paperback – April 12, 2005 by Cal Newport

How to Become a Straight-A Student: The Unconventional Strategies Real College Students Use to Score High While Studying Less Kindle Edition by {"isAjaxComplete_B001IGNR0U":"0","isAjaxInProgress_B001IGNR0U":"0"} Cal Newport (Author) › Visit Amazon's Cal Newport Page Find all the books, read about the author, and more. See search results for this author Are you an author? Learn about Author Central Cal Newport (Author)

How to Be a High School Superstar: A Revolutionary Plan to Get into College by Standing Out (Without Burning Out) 1st Edition, Kindle Edition by {"isAjaxComplete_B001IGNR0U":"0","isAjaxInProgress_B001IGNR0U":"0"} Cal Newport (Author) › Visit Amazon's Cal Newport Page Find all the books, read about the author, and more. See search results for this author Are you an author? Learn about Author Central Cal Newport (Author)

Deep Work: Rules for Focused Success in a Distracted World Hardcover – January 5, 2016 by Cal Newport

Learning How to Learn: How to Succeed in School Without Spending All Your Time Studying; A Guide for Kids and Teens Paperback – Illustrated, August 7, 2018 by Barbara Oakley PhD

A Mind for Numbers: How to Excel at Math and Science (Even If You Flunked Algebra) Audible Audiobook – Unabridged Barbara Oakley (Author), Grover Gardner (Narrator), Gildan Media, LLC (Publisher) & 2 more

Using the keyboard arrows, navigate down the suggestion list to the item(s) you want to remove from the Chrome autofill suggestions With the suggestion highlighted, use the appropriate keystroke sequence to delete the Chrome suggestion:

If the react cargo cult didn't have the JSX cowpath paved for them and acclimated to describing their app interface with vanilla javascript, they'd cargo cult around that. It's really about the path of least resistance and familiarity.

For the sake of best compatibility we convert the className attribute to class for svelte.

If there was a place I thought reactivity would be weak, I embraced it and I worked on it until I was happy with the results.

be quick to start books, quicker to stop them, and read the best ones again right after you finish

I pushed the build files & tested it in my environment so this should work as is.

I pushed a hotfix, based on v3.6.3 proposed by #2086 (comment) In package.json, under devDependencies, use: "svelte": "btakita/svelte#svelte-gh-2086-hotfix"

DX: start sapper project; configure eslint; eslint say that svelt should be dep; update package.json; build fails with crypt error; try to figure what the hell; google it; come here (if you have luck); revert package.json; add ignore error to eslint; Maybe we should offer better solution for this.

When the message say function was called outside component initialization first will look at my code and last at my configuration.

Most simple example: <script> import ChildComponent from './Child.svelte'; </script> <style> .class-to-add { background-color: tomato; } </style> <ChildComponent class="class-to-add" /> ...compiles to CSS without the class-to-add declaration, as svelte currently does not recognize the class name as being used. I'd expect class-to-add is bundled with all nested style declarations class-to-add is passed to ChildComponent as class-to-add svelte-HASH This looks like a bug / missing feature to me.

I wrote hundreds of Rect components and what I learned is that Componets should be able to be styled by developer who is using it.

color: red; //doesn't apply this rule, because scoping doesn't extend to children

Say I want to style this javascript routing anchor tag on various pages (some may be buttons, plain links, images) it makes it incredibly difficult. Eg:

Having to wrap everything in a selector :global(child) { } is hacky

I think instead, there would need to be some special way to make the distinction of what is a slot attribute and what is a slot prop to be consumed with let:. Maybe a new directive like <slot attr:class="abc"/>?

feel like there needs to be an easy way to style sub-components without their cooperation

The problem with working around the current limitations of Svelte style (:global, svelte:head, external styles or various wild card selectors) is that the API is uglier, bigger, harder to explain AND it loses one of the best features of Svelte IMO - contextual style encapsulation. I can understand that CSS classes are a bit uncontrollable, but this type of blocking will just push developers to work around it and create worse solutions.

There is a good amount of properties that should mostly be applied from a parent's point of view. We're talking stuff like grid-area in grid layouts, margin and flex in flex layouts. Even properties like position and and the top/right/left/bottom following it in some cases.

Svelte will not offer a generic way to support style customizing via contextual class overrides (as we'd do it in plain HTML). Instead we'll invent something new that is entirely different. If a child component is provided and does not anticipate some contextual usage scenario (style wise) you'd need to copy it or hack around that via :global hacks.

This allows passing classes to child components with svelte-{hash} through the class prop and prevents removing such classes from css.

The more I think about this, the more I think that maybe React already has the right solution to this particular issue, and we're tying ourselves in knots trying to avoid unnecessary re-rendering. Basically, this JSX... <Foo {...a} b={1} {...c} d={2}/> ...translates to this JS: React.createElement(Foo, _extends({}, a, { b: 1 }, c, { d: 2 })); If we did the same thing (i.e. bail out of the optimisation allowed by knowing the attribute names ahead of time), our lives would get a lot simpler, and the performance characteristics would be pretty similar in all but somewhat contrived scenarios, I think. (It'll still be faster than React, anyway!)

the ability to pass around element names as strings in place of components

No, this is about using a string to create an element of that tag name.

I would hope for it to come with React-like behavior where I could pass in a string (like div or a) and have it show up as a normal div/a element when the child component used it.

Part of the functionality that is returned are event handlers. I'd like to avoid needing to manually copy the events over one by one so the hook implementation details are hidden.

However, we've another unresolved problem - passing parent's styles to child components.