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How to calculate the number of occurrence of a given character in each row of a column of strings?
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A variation of https://stackoverflow.com/a/12430764/589165 is
> nchar(gsub("[^a]", "", q.data$string))
[1] 2 1 0
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Django filter queryset __in for *every* item in list
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How does the Windows Command Interpreter (CMD.EXE) parse scripts?
...ed.
For more information about Executed Labels vs. Unexecuted Labels, see https://www.dostips.com/forum/viewtopic.php?f=3&t=3803&p=55405#p55405
Phase 3) Echo the parsed command(s) Only if the command block did not begin with @, and ECHO was ON at the start of the preceding step.
Phase 4...
How to check if a string is a valid JSON string in JavaScript without using Try/Catch
...ill work in most cases, not all cases.
Have a look around the line 450 in https://github.com/douglascrockford/JSON-js/blob/master/json2.js
There is a regexp that check for a valid JSON, something like:
if (/^[\],:{}\s]*$/.test(text.replace(/\\["\\\/bfnrtu]/g, '@').
replace(/"[^"\\\n\r]*"|true|fal...
Bash history without line numbers
...(as well as other options for history formatting)
zsh> fc -ln 0
(See https://serverfault.com/questions/114988/removing-history-or-line-numbers-from-zsh-history-file)
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postgres: upgrade a user to be a superuser?
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Is Meyers' implementation of the Singleton pattern thread safe?
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What is the rationale behind having companion objects in Scala?
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Bootstrap Carousel : Remove auto slide
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Please enter a commit message to explain why this merge is necessary, especially if it merges an upd
...ticle explaining the difference between git pull & git pull --rebase.
https://www.derekgourlay.com/blog/git-when-to-merge-vs-when-to-rebase/
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