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What does map(&:name) mean in Ruby?
...
It's shorthand for tags.map(&:name.to_proc).join(' ')
If foo is an object with a to_proc method, then you can pass it to a method as &foo, which will call foo.to_proc and use that as the method's block.
The Symbol#to_proc method was originally added by ActiveSupport but has be...
Adding information to an exception?
...
I'd do it like this so changing its type in foo() won't require also changing it in bar().
def foo():
try:
raise IOError('Stuff')
except:
raise
def bar(arg1):
try:
foo()
except Exception as e:
raise type(e)(e.message + ...
Java 8: How do I work with exception throwing methods in streams?
...meException.
A normal wrapping idiom is something like:
private void safeFoo(final A a) {
try {
a.foo();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
(Supertype exception Exception is only used as example, never try to catch it yourself)
Then you can ...
fs: how do I locate a parent folder?
...
Try this:
fs.readFile(__dirname + '/../../foo.bar');
Note the forward slash at the beginning of the relative path.
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Git: How to remove file from index without deleting files from any repository
...o the file, they will get conflicts. To resolve such conflicts, use git rm foo.conf && git rebase --continue (if the conflicting commit has changes besides those to the removed file) or git rebase --skip (if the conflicting commit has only changed to the removed file).
Restore File as Untra...
Is it possible to forward-declare a function in Python?
...st, but it's clean.
You could create a recursion like the following:
def foo():
bar()
def bar():
foo()
Python's functions are anonymous just like values are anonymous, yet they can be bound to a name.
In the above code, foo() does not call a function with the name foo, it calls a funct...
What's the difference between using “let” and “var”?
...sing block denoted by { } (hence the block scope).
function run() {
var foo = "Foo";
let bar = "Bar";
console.log(foo, bar);
{
let baz = "Bazz";
console.log(baz);
}
console.log(baz); // ReferenceError
}
run();
The reason why let keyword was introduced to the language was f...
What is the difference between self::$bar and static::$bar in PHP?
...eferring to the class within which you use the keyword. In this case, your Foo class defines a protected static property called $bar. When you use self in the Foo class to refer to the property, you're referencing the same class.
Therefore if you tried to use self::$bar elsewhere in your Foo class ...
ViewBag, ViewData and TempData
... automatically evicted. The pattern is the following:
public ActionResult Foo()
{
// store something into the tempdata that will be available during a single redirect
TempData["foo"] = "bar";
// you should always redirect if you store something into TempData to
// a controller acti...
Why does the Scala compiler disallow overloaded methods with default arguments?
...guate overloaded versions) into the naming schema, e.g. in this case:
def foo(a: String)(b: Int = 42) = a + b
def foo(a: Int) (b: Int = 42) = a + b
it would be something like:
def foo$String$default$2 = 42
def foo$Int$default$2 = 42
Someone willing to write a SIP proposal?
...