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Postgres unique constraint vs index
...violates unique constraint "master_con_id_key"
DETAIL: Key (con_id)=(0) already exists.
test=# insert into master values (1, 0);
ERROR: duplicate key value violates unique constraint "master_unique_idx"
DETAIL: Key (ind_id)=(0) already exists.
test=#
It works as expected!
Foreign keys
Now we'...
Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell
...the only optimization I added deliberately is replacing mod with rem after reading this answer (heh, oops). See the link for my timings, but the short version is "almost identical to the C".
– C. A. McCann
Aug 6 '11 at 5:58
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Implode an array with JavaScript?
...s answer or some how make it go to the top? I missed this answer initially reading this.
– PressingOnAlways
Mar 1 '14 at 2:40
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Removing array item by value
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I think array_search is much more readable code than using the array_diff method. Upvote
– kendepelchin
Jan 21 '13 at 16:28
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Delete all lines beginning with a # from a file
...e "control-v tab").
For all these commands, omit the filename argument to read from standard input (e.g., as part of a pipe).
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Add file extension to files with bash
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find . | while read FILE; do if [ $(file --mime-type -b "$FILE") == "image/jpeg" ]; then mv "$FILE" "$FILE".jpg; fi; done;
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Rename a file in C#
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In the File.Move method, this won't overwrite the file if it is already exists. And it will throw an exception.
So we need to check whether the file exists or not.
/* Delete the file if exists, else no exception thrown. */
File.Delete(newFileName); // Delete the existing file if exists
F...
How to keep a .NET console app running?
...onsider a Console application that starts up some services in a separate thread. All it needs to do is wait for the user to press Ctrl+C to shut it down.
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Check whether a string matches a regex in JS
...})$/)) {
alert("match!");
}
But test() seems to be faster as you can read here.
Important difference between match() and test():
match() works only with strings, but test() works also with integers.
12345.match(/^([a-z0-9]{5,})$/); // ERROR
/^([a-z0-9]{5,})$/.test(12345); // true
/^([a-z0-...
Get context of test project in Android junit test case
...research the only working solution seems to be the one yorkw pointed out already. You'd have to extend InstrumentationTestCase and then you can access your test application's context using getInstrumentation().getContext() - here is a brief code snippet using the above suggestions:
public class Pri...