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How to map and remove nil values in Ruby
...ct it to become the norm very soon.
For example:
numbers = [1, 2, 5, 8, 10, 13]
enum.filter_map { |i| i * 2 if i.even? }
# => [4, 16, 20]
In your case, as the block evaluates to falsey, simply:
items.filter_map { |x| process_x url }
"Ruby 2.7 adds Enumerable#filter_map" is a good read on t...
How can I create an array with key value pairs?
...
150
Use the square bracket syntax:
if (!empty($row["title"])) {
$catList[$row["datasource_id"]]...
How do I make jQuery wait for an Ajax call to finish before it returns?
...type: 'GET',
async: false,
cache: false,
timeout: 30000,
fail: function(){
return true;
},
done: function(msg){
if (parseFloat(msg)){
return false;
} else {
return true;
}...
What does [ N … M ] mean in C aggregate initializers?
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90
It is initialization using Designated Initializers.
The range based initialization is a gnu...
How to hash a password
...ATED. Please use the recommendations from the https://stackoverflow.com/a/10402129/251311 instead.
You can either use
var md5 = new MD5CryptoServiceProvider();
var md5data = md5.ComputeHash(data);
or
var sha1 = new SHA1CryptoServiceProvider();
var sha1data = sha1.ComputeHash(data);
To get dat...
Specifying colClasses in the read.csv
...
answered May 10 '10 at 18:36
George DontasGeorge Dontas
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How does the Java 'for each' loop work?
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Sotirios Delimanolis
243k4848 gold badges601601 silver badges653653 bronze badges
answered Sep 17 '08 at 16:46
nsayernsayer
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Is returning by rvalue reference more efficient?
...O to omit doing a move or copy altogether. I recommend you to read BoostCon09 Rvalue References 101 which explains the matter, and how (N)RVO happens to interact with this.
Your case of returning an rvalue reference would be a good idea in other occasions. Imagine you have a getAB() function whic...
“render :nothing => true” returns empty plaintext file?
...et the content type like this:
render :nothing => true, :status => 200, :content_type => 'text/html'
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matplotlib Legend Markers Only Once
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K.-Michael Aye
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answered May 27 '11 at 1:22
DSMDSM
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