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Immutability of Strings in Java
...t, and changing a reference. s2 still points to the same object as we initially set s1 to point to. Setting s1 to "Help!" only changes the reference, while the String object it originally referred to remains unchanged.
If strings were mutable, we could do something like this:
String s1 = "Hello";
St...
Are multiple `.gitignore`s frowned on?
....gitignore file apply recursively to the (sub)directory the file is in and all its subdirectories, unless pattern contains '/' (so e.g. pattern name applies to any file named name in given directory and all its subdirectories, while /name applies to file with this name only in given directory).
...
How to swap keys and values in a hash
...;:b, 3=>:c}
BUT...
If you have duplicate values, invert will discard all but the last occurrence of your values (because it will keep replacing new value for that key during iteration). Likewise, key will only return the first match:
{a: 1, b: 2, c: 2}.key(2)
=> :b
{a: 1, b: 2, c: 2}.inv...
How to increase the maximum number of opened editors in IntelliJ?
... files limit if you are using the Recent Files (Cmd+E) feature.
Works for all IntelliJ IDEA platform based IDEs.
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Where does Xcode 4 store Scheme Data?
... use Xcode 4, and I'm trying to find the file in a project where it stores all of a project's Schemes. I figured they would be stored in a file in the xcodeproj directory somewhere, but for the life of me I can't find which one.
...
jQuery posting valid json in request body
...query string when sending requests, but setting processData:false should allow me to send actual JSON in the body. Unfortunately I'm having a hard time determining first, if this is happening and 2nd what the object looks like that is being sent to the server. All I know is that the server is no...
The difference between try/catch/throw and try/catch(e)/throw e
...he method containing that try-catch block.
Which one should you use? It really depends on each case.
Let's say you have a Person class with a .Save() method that will persist it into a database. Let's say that your application executes the Person.Save() method somewhere. If your DB refuses to save...
How to check if a column exists in Pandas
...
To check if one or more columns all exist, you can use set.issubset, as in:
if set(['A','C']).issubset(df.columns):
df['sum'] = df['A'] + df['C']
As @brianpck points out in a comment, set([]) can alternatively be constructed with curly...
Why does i = i + i give me 0?
...
230 + 230 = -231
-231 + -231 = 0
...in int arithmetic, since it's essentially arithmetic mod 2^32.
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What components are MVC in JSF MVC framework?
...e as below:
M - Entity
V - Facelets/JSP page
C - Managed bean
In the smaller client picture, the developer V is in turn dividable as below:
M - JSF component tree
V - Rendered HTML output
C - Client (webbrowser)
In the yet smaller JavaScript picture, the client V is in turn dividable as below:...