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In log4j, does checking isDebugEnabled before logging improve performance?

...xity of the code because there are fewer branches. Better yet is to use a more up-to-date logging framework where the log statements take a format specification and a list of arguments to be substituted by the logger—but "lazily," only if the logger is enabled. This is the approach taken by slf4j...
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How to debug stream().map(…) with lambda expressions?

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Why can templates only be implemented in the header file?

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What is the difference between i++ and ++i?

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What is the maximum number of characters that nvarchar(MAX) will hold?

...acters that will fit into a NVARCHAR(MAX) field. Using the other answer's more detailed numbers, you should be able to store (2 ^ 31 - 1 - 2) / 2 = 1'073'741'822 double-byte characters 1 billion, 73 million, 741 thousand and 822 characters to be precise in your NVARCHAR(MAX) column (unfortunate...
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What are '$$' used for in PL/pgSQL

...RICT IMMUTABLE; This isn't such a good idea. Use dollar-quoting instead, more specifically also put a token between the $$ to make it unique - you might want to use $-quotes inside the function body, too. I do that a lot, actually. CREATE OR REPLACE FUNCTION check_phone_number(text) RETURNS boo...
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How to wait for all goroutines to finish without using time.Sleep?

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Where is array's length property defined?

...ther it still does, off-hand). So while a StringBuilder is responsible for more memory, its immediate size and layout are fixed. – Jon Skeet Sep 20 '14 at 22:08 ...
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Python glob multiple filetypes

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How to detect reliably Mac OS X, iOS, Linux, Windows in C preprocessor? [duplicate]

... There is more... it should be #if TARGET_OS_IPHONE rather than #ifdef since TARGET_OS_IPHONE is defined as 0 on a Mac. – Steven Lu Jun 21 '12 at 5:45 ...