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Why does Clojure have “keywords” in addition to “symbols”?
... Clojure documentation for Keywords and Symbols.
Keywords are symbolic identifiers that evaluate to themselves. They provide very fast equality tests...
Symbols are identifiers that are normally used to refer to something else. They can be used in program forms to refer to function paramete...
Run java jar file on a server as background process
... Thanks Anton,currntly im stopping the server by killing the process id.i don't think it's best practice.is thery command to to stop the server?
– Bernad Ali
Aug 25 '12 at 5:01
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Is there an Eclipse line-width marker?
...t is a vertical line to be drawn in the editor showing where the max line width while I am typing, not just when I run the formmater. I know this feature is available in some capacity because it is displayed in the code formatter property page.
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PHP Foreach Pass by Reference: Last Element Duplicating? (Bug?)
...simply setting that variable to the new value each time like you would outside of a loop.
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How to determine one year from now in Javascript
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For anyone wondering how it deals with leap years, I did this in a Firefox console ... >> x = new Date('2000-02-29') -> Date 2000-02-29T00:00:00.000Z >> x.setYear(2001) -> 983404800000 >> x.toLocaleFormat('%d-%b-%Y') -> "01-Mar-2001"
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Check if two lists are equal [duplicate]
...tEquals(ints2);
This should work, because you are comparing sequences of IDs, which do not contain duplicates. If it does, and you need to take duplicates into account, the way to do it in linear time is to compose a hash-based dictionary of counts, add one for each element of the first sequence, ...
Postgres and Indexes on Foreign Keys and Primary Keys
...ndexes on primary keys and unique constraints, but not on the referencing side of foreign key relationships.
When Pg creates an implicit index it will emit a NOTICE-level message that you can see in psql and/or the system logs, so you can see when it happens. Automatically created indexes are visi...
IN vs OR in the SQL WHERE Clause
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| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
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| 0 | SELECT STATEMENT | ...
PDO's query vs execute
... standard SQL statement and requires you to properly escape all data to avoid SQL Injections and other issues.
execute runs a prepared statement which allows you to bind parameters to avoid the need to escape or quote the parameters. execute will also perform better if you are repeating a query mul...
Where does Chrome store extensions?
...ome/Default/Extensions/
if you go to chrome://extensions you'll find the "ID" of each extension. That is going to be a directory within Extensions directory. It is there you'll find all of the extension's files.
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