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What is tail recursion?
...return x;
} else {
return x + recsum(x - 1);
}
}
If you called recsum(5), this is what the JavaScript interpreter would evaluate:
recsum(5)
5 + recsum(4)
5 + (4 + recsum(3))
5 + (4 + (3 + recsum(2)))
5 + (4 + (3 + (2 + recsum(1))))
5 + (4 + (3 + (2 + 1)))
15
Note how every recur...
How to 'grep' a continuous stream?
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I use the tail -f <file> | grep <pattern> all the time.
It will wait till grep flushes, not till it finishes (I'm using Ubuntu).
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Python strftime - date without leading 0?
When using Python strftime , is there a way to remove the first 0 of the date if it's before the 10th, ie. so 01 is 1 ? Can't find a % thingy for that?
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StackOverflow程序员推荐：每个程序员都应读的30本书 - 杂谈 - 清泛网 - 专...
...个价是对得起这本书的。
你还不确信么？那就读读第一版的前言或序言。网上有免费的电子版。-Antti Sykäri
4. 《C程序设计语言》
推荐数：774
这本书简洁易读，会教给你三件事：C 编程语言；如何像程序员一样思考；底...
How do you test a public/private DSA keypair?
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This solution seems to work for all types of SSH-keys. I even managed to recover a misplaced public key with this approach.
– Jari Turkia
Jun 13 '18 at 6:37
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BASH copy all files except one
I would like to copy all files out of a dir except for one named Default.png. It seems that there are a number of ways to do this. What seems the most effective to you?
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How to export table as CSV with headings on Postgresql?
I'm trying to export a PostgreSQL table with headings to a CSV file via command line, however I get it to export to CSV file, but without headings.
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Adding new column to existing DataFrame in Python pandas
... because if you have multiple rows, and you use the assignment, it assigns all rows of the new column with that value ( in your case e) which is usually undesirable.
– Paniz
Apr 27 '19 at 22:42
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Programmatically selecting text in an input field on iOS devices (mobile Safari)
How do you programmatically select the text of an input field on iOS devices, e.g. iPhone, iPad running mobile Safari?
10 A...
How would you go about parsing Markdown? [closed]
...own. Its parser is based on a Parsing Expression Grammar parser generator called peg.
EDIT: Mauricio Fernandez recently released his Simple Markup Markdown parser, which he wrote as part of his OcsiBlog Weblog Engine. Because the parser is written in OCaml, it is extremely simple and short (268 SLO...