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How can I check if a program exists from a Bash script?
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How to determine if a number is a prime with regex?
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You said you understand this part, but just to emphasize, the String generated has a length eq...
How to calculate a Mod b in Casio fx-991ES calculator
Does anyone know how to calculate a Mod b in Casio fx-991ES Calculator. Thanks
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What would cause an algorithm to have O(log log n) complexity?
...ons by a constant, the algorithm must shrink the problem size down to 0 or 1. This is why, for example, binary search has complexity O(log n).
Interestingly, there is a similar way of shrinking down the size of a problem that yields runtimes of the form O(log log n). Instead of dividing the input ...
Generate colors between red and green for a power meter?
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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 do write IF ELSE statement in a MySQL query
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You probably want to use a CASE expression.
They look like this:
SELECT col1, col2, (case wh...
JS Client-Side Exif Orientation: Rotate and Mirror JPEG Images
... in large commercial web apps, support for EXIF orientation can be spotty 1 . The same source also provides a nice summary of the 8 different orientations a JPEG can have:
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Count number of records returned by group by
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