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How to return dictionary keys as a list in Python?
... generalizations (PEP 448) were introduced with Python 3.5 allowing you to now easily do:
>>> newdict = {1:0, 2:0, 3:0}
>>> [*newdict]
[1, 2, 3]
Unpacking with * works with any object that is iterable and, since dictionaries return their keys when iterated through, you can easil...
How to run Gulp tasks sequentially one after the other
..., my co-worker submitted a PR to convert it over.
– knownasilya
Jun 10 '14 at 13:12
3
...
Rails: What's a good way to validate links (URLs)?
...alid hostname
http://host.foo
as well the following one
http://localhost
Now, let me give you some solutions.
If you want to validate a domain, then you need to forget about regular expressions. The best solution available at the moment is the Public Suffix List, a list maintained by Mozilla. I cr...
Mapping many-to-many association table with extra column(s)
...= other.getId())
return false;
return true;
}
}
Now, we have to create the association table. The first step is to create an object representing a complex primary key (a.id, c.id).
public class ACId implements Serializable{
private A a;
private C c;
public A...
Show and hide a View with a slide up/down animation
...rstanding an applying the accepted answer. I needed a little more context. Now that I have figured it out, here is a full example:
MainActivity.java
public class MainActivity extends AppCompatActivity {
Button myButton;
View myView;
boolean isUp;
@Override
protected void on...
What's the advantage of a Java enum versus a class with public static final fields?
...");. I change the signature of Foo::bar to public void bar(String foobar). Now the person who called someFoo will need to modify their code if they still want it to work.
– Jeffrey
Jul 15 '15 at 16:09
...
JavaScript checking for null vs. undefined and difference between == and ===
...gain, 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`
// (and `""`, and `0`, and `NaN`, and [of course] `f...
diff current working copy of a file with another branch's committed copy
...branch. I switched to bar branch and made some changes to foo . How can I now run a git diff between this copy (which isn't committed yet) and the copy of the master branch?
...
Can comments be used in JSON?
...n the processes that generates/receives the JSON, as they are supposed to know what the JSON data will be in advance, or at least the structure of it.
But if you decided to:
{
"_comment": "comment text goes here...",
"glossary": {
"title": "example glossary",
"GlossDiv": {
...
Test if characters are in a string
... will be doing a lot of these computations).
– Greg Snow
Apr 12 '12 at 18:10
1
@Josh O'brien, tha...