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Difference between map and collect in Ruby?
...chmark code:
require 'benchmark'
h = { abc: 'hello', 'another_key' => 123, 4567 => 'third' }
a = 1..10
many = 500_000
Benchmark.bm do |b|
GC.start
b.report("hash keys collect") do
many.times do
h.keys.collect(&:to_s)
end
end
GC.start
b.report("hash keys map") ...
How to check if a string is a valid date
...
DateTime.parse "123" rescue nil . This returns a real date.. May 3 2017
– baash05
Apr 5 '17 at 6:09
3
...
DISTINCT for only one column
...| NOMBRES || MAIL
888 || T800 ARNOLD || t800.arnold@cyberdyne.com
123 || JOHN CONNOR || s.connor@skynet.com
125 || SARAH CONNOR ||s.connor@skynet.com
And you need to select only distinct mails.
You can do it with this:
SQL SELECT:
SELECT MAX(p.CLIENTE) AS ID_CLIENTE
, (SELECT TOP ...
How to make sure that string is valid JSON using JSON.NET
...tc was based on the fact that JToken.Parse would parse the values such as "1234" or "'a string'" as a valid token. The other option could be to use both JObject.Parse and JArray.Parse in parsing and see if anyone of them succeeds, but I believe checking for {} and [] should be easier. (Thanks @Rhino...
The key must be an application-specific resource id
...e a constant defined in your code (such as private static final int MYID = 123) or any other int that you define as a field somewhere.
The id has to be a precompiled unique id, just like the ones you get for strings that you put in values/strings.xml (ie R.string.mystring). Refer to http://develope...
SqlDataAdapter vs SqlDataReader
...
AdaTheDevAdaTheDev
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Can I change a private readonly field in C# using reflection?
...afe void ForceSet()
{
fixed (int* ptr = &i) *ptr = 123;
}
static void Main(string[] args)
{
var program = new Program();
Console.WriteLine("Contructed Value: " + program.i);
program.ForceSet();
Console.W...
How to get GET (query string) variables in Express.js on Node.js?
...ption = query.option;
where the URL for get should be
/path/filename?id=123&option=456
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What is the “FS”/“GS” register intended for?
...ritten code on 6809 (with and without paged memory), 6502, z80, 68k and 80[123]?86, my perspective is that segmented memory is a horror show and I'm glad it was consigned to the dustbin of history. The use of FS and GS for efficient access of thread_local data is a happy unintended consequence of an...
Java String - See if a string contains only numbers and not letters
... You probably want to add anchors (e.g. ^[0-9]+$) otherwise abc123def will be considered a number.
– ICR
Sep 13 '13 at 21:37
10
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