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How to check if a String is numeric in Java
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This answer is concise, simple and readable. You can almost read it like English -- "chars all match digits". It requires no third-party libraries. It does not use exceptions in non-exceptional cases. This should become the accepted answer.
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How to use Active Support core extensions
...oing to assume you're trying to add Active Support to a non-Rails script.
Read "How to Load Core Extensions".
Active Support's methods got broken into smaller groups in Rails 3, so we don't end up loading a lot of unneeded stuff with a simple require 'activesupport'. Now we have to do things like...
AES vs Blowfish for file encryption
I want to encrypt a binary file. My goal is that to prevent anyone to read the file who doesn't have the password.
7 Answer...
Test if characters are in a string
... which is itself an acronym of "Global Regular Expression Print", it would read lines of input and then print them if they matched the arguments you gave. "Global" meant the match could occur anywhere on the input line, I'll explain "Regular Expression" below, but the idea is it's a smarter way to m...
Copy the entire contents of a directory in C#
...h this code as it will throw an exception if the target directory exists already. It will also not overwrite files that already exists. Simply add a check before creating each directory and use the overload of File.Copy to overwrite target file if exists.
– joerage
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Elegant way to check for missing packages and install them?
... R users and don't realize that they have to install packages they don't already have.
29 Answers
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C library function to perform sort
... big :-) And, @AndreyT, clever though that hack is, I prefer my code to be readable :-)
– paxdiablo
Nov 24 '09 at 11:44
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How to write LaTeX in IPython Notebook?
...X Primer I've seen: It clearly shows how to use LaTeX commands in easy to read, and easy to remember manner !! Highly recommended.
This Link has Excellent Examples showing both the code, and the rendered result !
You can use this site to quickly learn how to write LaTeX by example.
And, here i...
Convert JSON style properties names to Java CamelCase names with GSON
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I have found the following setting works perfect when reading json with underscored attributes and using camelcasing in my models.
Gson gson = new GsonBuilder()
.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
.create()
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What's the difference between backtracking and depth first search?
...raph it deals with is explicitly constructed and unacceptable cases have already been thrown, i.e. pruned, away before any search is done.
So, backtracking is DFS for implicit tree, while DFS is backtracking without pruning.
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