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I have understood for java code coverage tools like jacoco. but i see that there are a lot of javascript code coverage tools available. I am just getting curious, that how do they work internally and give us the percentage report.
As far as I know, these tools add extra code to our inspected files to count function and line hits. These tools store this hits in a map, where you could find the file and functions related to each line.
After that is pretty easy to calculate the coverage of each file/function.
I just found this information here, Istanbul is an example of code coverage tooling in JS. There's a lot more!
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I need to take screenshots of a website continuously and pipe these data into a python array as fast as possible. Desirable would be at least 30 fps. It would be nice to have one screenshot/frame per function call, because I have to inject some JavaScript to the website after each frame.
The website is running a webgl canvas and is expecting keyboard input.
I already tried to make it with selenium and headless Firefox, but this is way too slow. What do you think is the best way to go to get close to my requirements?
Thanks in advance.
I would recommend to use Python MSS. This library is intended exactly to take screenshots really fast. It is currently maintainable and cross-platform, and has good documentation.
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I've created a few simple HTML/CSS/JS games. This time a few friends and I are going to create another game that people can download from some website. We want to use HTML CSS and JS even though that is probably not the best option.
All the games I created before I've used Chrome to run them. Of course I can't just make people run my games with Chrome. So how should I run it?
You can try using Electron (http://electron.atom.io/). You can use it to build desktop apps using Html/Css/Js.
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I'm trying to write javascript code that affects the breakpoints in debugging mode in Chrome console.
something like:
function someJavascriptCode() {
console.log('will stop here for debugging');
debugger; // stop!
chrome.debugger.stepOver(); // just like clicking F10 in the console when in a breakpoint
console.log('This line just happened because of the previous line');
}
Any ideas?
Nothing like that is implemented, nor is it likely to be in that manner because it doesn't make any sense to have functions to control the debugger in runtime code. It could possibly be done with some kind of directive, but I doubt anything like that exists and I can't really think of any genuine use cases.
If you're looking to do this externally, you might want to take a look at the remote debugging protocol or writing a debugger extension.
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I'm using Notepad++ in writing Javascript files. But the syntax highlighting is not that good there.
For example methods and properties of known objects, like arrays, numbers or even AJAX object are not highlighted at all.
Can this be improved by adding a plugin or something ? if so can you specify a plugin for me ?
Thanks
In Notepad++ you can go to the plugins tab and then to plugin manager and it will show you all available and installed plugins. Just scroll down the list until you find one that suits your needs and install it. If you don't see it on the list I don't think you will find it anywhere else.
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I'm coming from statically typed languages like C++ where there are tools (the compiler for one) that will remind me if I forget something obvious while refactoring. For example, if I change the number of arguments to a function but I forget to change all the calls to it. But it seems really easy to make this type of mistake in javascript. How do you avoid problems like this when refactoring javascript?
just like you do in c++/java. By writing tests.
Unit tests are the best. If you code is MVC, then you can certainly have unit tests with little effort, at least for the model layer. The benefit is you get feedback immediately. Check out QUnit
Functional tests via Selenium or equivalent are good too. They will find problems, but not immediately.
Only thing like that I can think of is: JSLint (http://jslint.com/)