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JavaScript “new Array(n)” and “Array.prototype.map” weirdness
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I had a task that I only knew the length of the array and needed to transform the items.
I wanted to do something like this:
let arr = new Array(10).map((val,idx) => idx);
To quickly create an array like this:
[0,1,2,3,4,5,6,7,8,9]
But it didn't work because:
(see Jonathan Lonowski'...
Get names of all files from a folder with Ruby
...File.file? f }
# In another directory, relative or otherwise, you need to transform the path
# so it is either absolute, or relative to the current working dir to call File.xxx functions:
#
home = "/home/test"
Dir.entries( home ).select{ |f| File.file? File.join( home, f ) }
[1] .dotfile on unix...
What datatype to use when storing latitude and longitude data in SQL databases? [duplicate]
...roduce extra digits which would only be noise. Also the decimal-to-binary transformation will make the final decimal place suspicious and possibly wrong. Fine for some purposes. Lousy for navigation.
– S.Lott
Jul 28 '09 at 20:10
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Apache Kafka vs Apache Storm
...MS, log files, etc), and Kafka Streams to do the stream processing (joins, Transforms, filters, aggregations), and back to Kafka Connect to write out to another database or repository.
– Hans Jespersen
Jan 22 '18 at 0:30
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How to sort my paws?
... to the 20x20 image of each "template" paw, we compare the 50-dimensional, transformed image to each 50-dimensional transformed template paw. This is much less sensitive to small variations in exactly how each toe is positioned, etc, and basically reduces the dimensionality of the problem to just t...
How to Convert Boolean to String
...5.5+ installations, var_export(boolval($var), true) is a safe way route to transform the value into the strings "true" or "false".
– faintsignal
Nov 1 '16 at 15:29
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In what order are Panels the most efficient in terms of render time and performance?
... invoked again if additional Children are added to the collection, a LayoutTransform is applied, or the UpdateLayout method is called.
See LayoutSystem_Measure_Arrange for more information on the measuring and arranging of children
LayoutSystem_Performance :
Layout is a recursive process. Each c...
Can I convert long to int?
... This worked best for me, as all other attempts to bit mask transformed 281474976710656 (2^48) to 0.
– GuiRitter
Aug 26 at 12:04
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Iterating each character in a string using Python
...e to use a more functional approach to iterating over a string (perhaps to transform it somehow), you can split the string into characters, apply a function to each one, then join the resulting list of characters back into a string.
A string is inherently a list of characters, hence 'map' will iter...
What's the fastest way to do a bulk insert into Postgres?
... Most important in this kind of procedure (raw data ingestion) is the transformation, expressed in a SQL standard (no use of exotic tools). See stackoverflow.com/a/62493516/287948
– Peter Krauss
Aug 26 at 13:51
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