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Should I use 'has_key()' or 'in' on Python dicts?
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The WebSphere update in 2013 uses Jython 2.1 as its main scripting language. So this is unfortunately still a useful thing to note, five years after you noted it.
– ArtOfWarfare
Sep 24 '14 at 11:49
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typeof !== “undefined” vs. != null
I often see JavaScript code which checks for undefined parameters etc. this way:
11 Answers
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About catching ANY exception
...ht and swallowed those then you could make it hard for anyone to exit your script.
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How can I count the occurrences of a list item?
...at Counter is faster by a constant factor of approximately 2.
Here is the script I used:
from __future__ import print_function
import timeit
t1=timeit.Timer('Counter(l)', \
'import random;import string;from collections import Counter;n=1000;l=[random.choice(string.ascii_letters) f...
How to loop through file names returned by find?
...add <&3 or -u3 to the read part, basically using a separate file descriptor. Also, I believe read -d '' is the same as read -d $'\0' but I can't find any official documentation on that right now.
– phk
Mar 13 '16 at 1:00
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How to do joins in LINQ on multiple fields in single join
...} syntax. LinqPad is a great tool to see how expressions are behaving (SQL script if LINQ2SQL is used, expression trees etc.)
– Alexei
Sep 8 '16 at 14:57
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Get last result in interactive Python shell
... It only works in the interactive shell, though. Don't rely on it for scripts.
– John Fouhy
Oct 14 '08 at 4:54
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What does .SD stand for in data.table in R
... which other covariates are included in the specification?
Here's a short script leveraging the power of .SD which explores this question:
# this generates a list of the 2^k possible extra variables
# for models of the form ERA ~ G + (...)
extra_var = c('yearID', 'teamID', 'G', 'L')
models =
l...
SQL Server: Maximum character length of object names
...xplained here.
And the verification can be easily made with the following script contained in the blog post before:
DECLARE @i NVARCHAR(800)
SELECT @i = REPLICATE('A', 116)
SELECT @i = 'CREATE TABLE #'+@i+'(i int)'
PRINT @i
EXEC(@i)
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Use dynamic variable names in JavaScript
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Since ECMA-/Javascript is all about Objects and Contexts (which, are also somekind of Object), every variable is stored in a such called Variable- (or in case of a Function, Activation Object).
So if you create variables like this:
var a =...