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When is .then(success, fail) considered an antipattern for promises?
...that you shouldn't use it in chains. The expectation is that you only have one final handler which handles all errors - while, when you use the "antipattern", errors in some of the then-callbacks are not handled.
However, this pattern is actually very useful: When you want to handle errors that hap...
Can you use if/else conditions in CSS?
... could do something along the line:
:root {
--main-bg-color: brown;
}
.one {
background-color: var(--main-bg-color);
}
.two {
background-color: black;
}
Finally, you can preprocess your stylesheet with your favourite server-side language. If you're using PHP, serve a style.css.php file,...
Remove property for all objects in array
...forEach. As you mention prototype, prototype.js also has a shim.
delete is one of the worst "optimization killers". Using it often breaks the performances of your applications. You can't avoid it if you want to really remove a property but you often can either set the property to undefined or just b...
What's the difference between HEAD, working tree and index, in Git?
Can someone tell me the difference between HEAD, working tree and index, in Git?
5 Answers
...
How does one unit test routes with Express?
...s:
describe('GET /users', function(){
it('respond with json', function(done){
request(app)
.get('/users')
.set('Accept', 'application/json')
.expect(200)
.end(function(err, res){
if (err) return done(err);
done()
});
})
});
Upside: you can tes...
Global variables in Javascript across multiple files
...est too. I had a similar problem, so I decided to test out 3 situations:
One HTML file, one external JS file... does it work at all - can functions communicate via a global var?
Two HTML files, one external JS file, one browser, two tabs: will they interfere via the global var?
One HTML file, open...
JavaScript checking for null vs. undefined and difference between == and ===
... (a == undefined) // but see note below
...but again, note that the last one is vague; it will also be true if a is null.
Now, despite the above, the usual way to check for those is to use the fact that they're falsey:
if (!a) {
// `a` is falsey, which includes `undefined` and `null`
//...
How to handle code when app is killed by swiping in android?
... the home button and kill the app by swiping it from the recent app list, none of the events like onPause() , onStop() or onDestroy() gets called rather the process is terminated. So if i want my services to stop, kill notifications and unregister listeners, how can i do that? I read quite a fe...
How does Java handle integer underflows and overflows and how would you check for it?
...can store larger values, e.g. long or maybe java.math.BigInteger. The last one doesn't overflow, practically, the available JVM memory is the limit.
If you happen to be on Java8 already, then you can make use of the new Math#addExact() and Math#subtractExact() methods which will throw an Arithmet...
How to remove item from array by value? [duplicate]
...
@madeinstefano, one or two examples of the funny (bad) things that would happen?
– Majid Fouladpour
Jul 23 '13 at 22:38
2...