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How to map and remove nil values in Ruby
... and I'd expect 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 g...
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?
...ion that requires login. If the user is logged in the function will return 1 on success. If not, the function will return the login-page.
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How to hash a password
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61
UPDATE: THIS ANSWER IS SERIOUSLY OUTDATED. Please use the recommendations from the https://stack...
What does [ N … M ] mean in C aggregate initializers?
From sys.c line 123:
1 Answer
1
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Specifying colClasses in the read.csv
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answered May 10 '10 at 18:36
George DontasGeorge Dontas
26.7k1717 gold badges100100 silver badges138138 bronze badges
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How does the Java 'for each' loop work?
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1193
for (Iterator<String> i = someIterable.iterator(); i.hasNext();) {
String item = i....
Is returning by rvalue reference more efficient?
...
Beta_ab&&
Beta::toAB() const {
return move(Beta_ab(1, 1));
}
This returns a dangling reference, just like with the lvalue reference case. After the function returns, the temporary object will get destructed. You should return Beta_ab by value, like the following
Beta_ab...
Pandas conditional creation of a series/dataframe column
...', 'green', 'red')
print(df)
yields
Set Type color
0 Z A green
1 Z B green
2 X B red
3 Y C red
If you have more than two conditions then use np.select. For example, if you want color to be
yellow when (df['Set'] == 'Z') & (df['Type'] == 'A')
otherwise blu...
How to return only the Date from a SQL Server DateTime datatype
Returns: 2008-09-22 15:24:13.790
43 Answers
43
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