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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...
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
...
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,...
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 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...
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 do you track record relations in NoSQL?
...normalized table), then do it that way.
But this inevitably optimizes for one type of query (e.g. comments by any user for a given article) at the expense of other types of queries (comments for any article by a given user). If your application has the need for both types of queries to be equally ...
Why is “except: pass” a bad programming practice?
...me, the file exists). Now imagine we get a IsADirectoryError, or a PermissionError instead. In such cases, we probably do not want to continue; we could still apply our default configuration, but we later won’t be able to save the file. And it’s likely that the user meant to have a custom config...
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...
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...