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How to initialize an array in one step using Ruby?
...o It:
plus_1 = 1.method(:+)
Array.new(3, &plus_1) # => [1, 2, 3]
If 1.method(:+) wasn't possible, you could also do
plus_1 = Proc.new {|n| n + 1}
Array.new(3, &plus_1) # => [1, 2, 3]
Sure, it's overkill in this scenario, but if plus_1 was a really long expression, you might want ...
Getting a map() to return a list in Python 3.x
...t cases, this ends up saving memory, and should make things go faster.
If all you're going to do is iterate over this list eventually, there's no need to even convert it to a list, because you can still iterate over the map object like so:
# Prints "ABCD"
for ch in map(chr,[65,66,67,68]):
p...
$_POST vs. $_SERVER['REQUEST_METHOD'] == 'POST'
Some guy called one of my Snipplr submissions "crap" because I used if ($_SERVER['REQUEST_METHOD'] == 'POST') instead of if ($_POST)
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How do you read from stdin?
...t():
pass
fileinput will loop through all the lines in the input specified as file names given in command-line arguments, or the standard input if no arguments are provided.
Note: line will contain a trailing newline; to remove it use line.rstrip()
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What is the proper way to check if a string is empty in Perl?
I've just been using this code to check if a string is empty:
6 Answers
6
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Find MongoDB records where array field is not empty
...
If you also have documents that don't have the key, you can use:
ME.find({ pictures: { $exists: true, $not: {$size: 0} } })
MongoDB don't use indexes if $size is involved, so here is a better solution:
ME.find({ pictures:...
How to read and write excel file
...che POI HSSF. Here's an example on how to read an excel file:
try {
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(file));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row;
HSSFCell cell;
int rows; // No of rows
rows ...
Check if bash variable equals 0 [duplicate]
I have a bash variable depth and I would like to test if it equals 0. In case yes, I want to stop executing of script. So far I have:
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What is the Python 3 equivalent of “python -m SimpleHTTPServer”
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And python3 -m http.server 8080 if You need to bind to a port. Read more at the end of the section: docs.python.org/3/library/…
– AdamKalisz
Aug 22 '18 at 8:36
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How to generate random number with the specific length in python
... this snipet give you a result of 037??? it's a randint from (100 to 1000) if n ==3
– moldovean
Jan 7 '14 at 10:17
3
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