JavaScript30 | 30 Day Vanilla JS Challenge | Runtime Evironment library

 by   wesbos HTML Version: Current License: No License

kandi X-RAY | JavaScript30 Summary

kandi X-RAY | JavaScript30 Summary

JavaScript30 is a HTML library typically used in Server, Runtime Evironment, Nodejs applications. JavaScript30 has no bugs, it has no vulnerabilities and it has medium support. You can download it from GitHub.

Starter Files + Completed solutions for the JavaScript 30 Day Challenge. Grab the course at

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              JavaScript30 has a medium active ecosystem.
              It has 24545 star(s) with 33069 fork(s). There are 685 watchers for this library.
              It had no major release in the last 6 months.
              JavaScript30 has no issues reported. There are 37 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of JavaScript30 is current.

            kandi-Quality Quality

              JavaScript30 has no bugs reported.

            kandi-Security Security

              JavaScript30 has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              JavaScript30 does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              JavaScript30 releases are not available. You will need to build from source code and install.

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            JavaScript30 Key Features

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            JavaScript30 Examples and Code Snippets

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            Community Discussions


            Browsersync IDE error "Couldn't open browser (if you are using BrowserSync in a headless environment, you might want to set the open option to false)"
            Asked 2021-Jun-11 at 10:03

            I'm stuck on lesson 19 of this course - - which uses Browsersync to provide access to the webcam.

            These are the files I'm working with:

            Having run npm install I get this error when trying to run the package that includes Browsersync and none of the URLs below work for me:



            Answered 2021-Jun-11 at 10:03

            The CS50 IDE provides a "cloud-based Ubuntu environment", but that means "localhost" according to the browsersync output you're seeing isn't your localhost ― it's the localhost of that cloud environment.

            (And the "External" direct IP access will be incorrect too, since it references a local network that your computer isn't attached to.)

            The IDE might provide a way for you to access a server that's running in this way, but I suspect a simpler path is to run the start script directly on your local machine.



            What's going on the function inside of reduce method in JavaScript? - JavaScript30 exercise
            Asked 2021-Feb-23 at 09:54

            I have been working on the array exercise on Wes Bos's JavaScript30. Please help me out with this exercise., which is #8.

            The code in the video is the following.



            Answered 2021-Feb-23 at 09:45


            How do I setState when my drum-pad triggers an onClick function?
            Asked 2020-Oct-09 at 05:50

            I'm a newbie to React and currently building a drum-machine. I have wired up the drum-machine to play an audio contained inside its DrumPad child component.My problem is am failing make an id representing each audio display whenever its parent drum-pad div is clicked. I know I need to initialize state and then setState but I dont know how to implement it in my code.

            here is my code



            Answered 2020-Oct-09 at 05:50

            for updating the state, you need to pass the function handleDisplay to DrumPad and call the handleDisplay inside handleClick, passing the required data as parameters.




            Error while building a drum machine using React
            Asked 2020-Oct-06 at 15:09

            I'm building a fcc-drum machine using React I get the following error when trying to map a data object:

            Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

            Check the render method of App.

            Below is the data that I am trying to map along with my code:



            Answered 2020-Oct-06 at 03:22

            I would recommend taking a look at this question to find out more details about your error, but nevertheless, I've shared a working example below using functional components and fixing the missing key error mentioned by @DaniilLoban. The working example will print out the value of the letter and id keys from each object in your soundData array.




            Why the es6 template-string needs double quart in this occasion Javascript?
            Asked 2020-Sep-26 at 11:35

            I`m on the Javascript30 #1 now, and I`ve been wondering about a small stuff...

            This code below worked.



            Answered 2020-Sep-26 at 10:33


            images aren't appearing in image gallery
            Asked 2020-Apr-22 at 10:57

            I am trying to create a swim image gallery based off of the Flex Panel Gallery from Javascript30 (Repo Link). When trying to display the site in a browser, the images immediately go out of frame and all I can see is the background of the five flex columns on the page.

            I am unsure as to why they are pushed downwards out of view in the browser and why the text (which isn't in column orientation) doesn't appear until after I click within the columns.



            Answered 2020-Apr-22 at 09:27

            By watching the repo site example, you should apply the image background to parent div, like this:



            Making a clock. How do I make the hour hand shorter but coming out from the center?
            Asked 2020-Apr-02 at 01:26

            This is from the Javascript30 course. I am making a clock but I want to make the hour hand shorter than the minute hand. The minute hand is currently set to a width of 50%. I want to set the hour hand to 40%. But when I change the width to 40%, it seems to rotate from a different origin. Then I changed the transform-origin to 120% but it seems like it is centered differently?



            Answered 2020-Apr-02 at 01:22

            Since it is absolutely positioned, you can use left to set it correctly, because when you decrease the width, it's moving to the left.



            Why doesn't console.table() work for all objects/arrays?
            Asked 2020-Jan-21 at 16:27

            Why doesn't console.table() work for all objects / arrays?

            With some data I get a nicely formatted table in the developer console. With other data I get nothing... not even an error message.

            I just learned about console.table() while going through the challenges of #Javascript30. The presenter used console.table() for some of the output, but not all, and he didn't explain why. I tried to use it for all of the (array or object) output and saw why... it doesn't work.

            Here's an example of one that doesn't work.



            Answered 2019-Sep-21 at 05:51

            I'm currently working on the same exercise for JS30 and encountered the same problem as you, which led me here.

            I consulted the console.table() page on MDN, and after doing some testing it appears that this might be a Chrome issue.

            From my limited testing, it seems like Chrome doesn't output a table for collections of primitive types (array of strings, single object), only collections of compound types (array of arrays/objects, object whose properties are objects).

            This doesn't work:


            But this does:


            I also tested on Canary, but had the same results.

            However on Firefox, console.table() seems to work correctly. The MDN examples of collections of primitive types worked on Firefox, but not on Chrome.

            To have an output on Chrome for your example, what you could do is put the transportation variable inside its own array, so that Chrome will print the table.



            Bug with transitionend event not correctly removing a CSS class
            Asked 2020-Jan-16 at 11:37

            I recently have been learning more JavaScript as I am going to be using it a lot for an upcoming internship. The company recommended many different resources for me to look at, but a friend of mine also suggested this website:


            I decided to give it a try and started yesterday on the first project which was a JavaScript drumkit.

            So the overall project wasn't hard, but I noticed a little bug that was happening. So the project attaches a 'keydown' event listener to several different HTML elements that trigger when either ASDFGHJKJL are pressed. In addition to playing a sound, the listener also attaches a class to the element that adds a little effect to the key being pressed.

            To remove the class, we attached a transitionend listener to the elements. So when the CSS property finishes the transition after the key is pressed, the class is then removed and the graphic goes back to normal in the browser.

            Now if you press the keys slowly, it works perfectly fine. But I noticed that if you were to hold a key down for a second or two, it appears as though the class that gets added is never removed and the graphic is permanent. I then checked the console and noticed that the transitionend event never fires once it gets stuck like that.

            Here is the code from the finished file.



            Answered 2017-May-15 at 04:39

            There are 2 causes for this unable to remove CSS class problem:

            1. The flag to mark whether animation is played is class playing, which is also the key to switch on/off the animation. This setting makes the problem very complicated.
            2. The flag/mark change is adding/removing class playing. It is a DOM operation which costs more time than necessary.

            To solve this problem, it is better to store flag/mark information in memory (as a variable), and stop keyboard event listener if transition is not completed.

            Store flag/mark information in a variable:



            Generating Search suggestions in React?
            Asked 2019-Oct-18 at 16:14

            I am looking to generate search suggestions that match data collected, like so:

            As you type in you get suggestions:

            I am referencing some of the tutorial work from WesBos:


            I've got the data logging in the console but now I am unsure how to get it to render. Below are my components (My thoughts were to generate the divs as a loop in App.js and pass the props to Match.js which I would eventually import but I am not sure if I am approaching this wrong):




            Answered 2019-Oct-18 at 14:14

            I think your initial instinct as to how to do this is correct :

            1. get the matches
            2. store them in state
            3. map over the state and render one component per match, passing the relevant data as props

            To answer your question exactly, mapping over state to render component usually looks something like this :


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