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difference between each.with_index and each_with_index in Ruby?
...
The with_index method takes an optional parameter to offset the starting index. each_with_index does the same thing, but has no optional starting index.
For example:
[:foo, :bar, :baz].each.with_index(2) do |value, index|
puts "#{index}: #{value}"
end
[:foo, :bar, :baz].each_with_i...
Regular expression to check if password is “8 characters including 1 uppercase letter, 1 special cha
...
( # Start of group
(?=.*\d) # must contain at least one digit
(?=.*[A-Z]) # must contain at least one uppercase character
(?=.*\W) # must contain at least one special symbol
. ...
Why this line xmlns:android=“http://schemas.android.com/apk/res/android” must be the first in the la
...ix must be defined. The namespace is defined by the xmlns attribute in the start tag of an element. The namespace declaration has the following syntax. xmlns:prefix="URI".
Note: The namespace URI is not used by the parser to look up information.
The purpose is to give the namespace a unique name. ...
What special characters must be escaped in regular expressions?
...racter class metacharacters as literals. Put the ^ anywhere except at the start, the ] at the start, and the - at the start or the end of the character class to match these literally, e.g.:
[]^-]
In POSIX basic regular expressions (BRE), these are metacharacters that you need to escape to suppre...
How to pattern match using regular expression in Scala?
...tring) =
params.headOption flatMap (_.r unapplySeq str)
}
class StartsWithExtractor(params: List[String]) {
def unapply(str: String) =
params.headOption filter (str startsWith _) map (_ => str)
}
class MapExtractor(keys: List[String]) {
def unapplySeq[T](map: Map[Str...
How do I convert a String object into a Hash object?
...this requires the same to be true of all of the objects in the hash.
If I start with the hash {:a => Object.new}, then its string representation is "{:a=>#<Object:0x7f66b65cf4d0>}", and I can't use eval to turn it back into a hash because #<Object:0x7f66b65cf4d0> isn't valid Ruby ...
Is gcc std::unordered_map implementation slow? If so - why?
...;typename TEST>
void time_test (TEST t, const char *m) {
struct tms start;
struct tms finish;
long ticks_per_second;
times(&start);
t();
times(&finish);
ticks_per_second = sysconf(_SC_CLK_TCK);
std::cout << "elapsed: "
<< ((finish...
How can jQuery deferred be used?
...a REST server. In this case, I don't want the browser-side application to start loading data before it has all the schemas loaded. $.when.apply().then() is perfect for this. Thank to Raynos for pointers on using then(fn1, fn2) to monitor for error conditions.
fetch_sources = function (schema_u...
Origin null is not allowed by Access-Control-Allow-Origin
...r upload your data to a temporary server. If you still want to use Chrome, start it with the below option;
--allow-file-access-from-files
More info how to add the above parameter to your Chrome: Right click the Chrome icon on your task bar, right click the Google Chrome on the pop-up window and c...
What does Docker add to lxc-tools (the userspace LXC tools)?
...a throwaway interactive shell.
LXC already provides this.
I only just started learning about LXC and Docker, so I'd welcome any corrections or better answers.
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