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What do the plus and minus signs mean in Objective-C next to a method?
...tain object instances directly using special syntax, like in the case of a string like this:
NSString *myStringInstance = @"abc";
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How to change the CHARACTER SET (and COLLATION) throughout a database?
...DEFAULT is not null, CONCAT(' DEFAULT \'', COLUMN_DEFAULT, '\''), ''), if (EXTRA != '', CONCAT(' ', EXTRA), '')))), ';') as alter_statement
FROM information_schema.columns a
INNER JOIN INFORMATION_SCHEMA.TABLES b ON a.TABLE_CATALOG = b.TABLE_CATALOG
AND a.TABLE_SCHEMA = b.TABLE_SCHEM...
How to use sed to replace only the first occurrence in a file?
...o' with 'bar' in the first matching line only.
Due to use of ANSI C-quoted strings ($'...') to provide the sample input lines, bash, ksh, or zsh is assumed as the shell.
GNU sed only:
Ben Hoffstein's anwswer shows us that GNU provides an extension to the POSIX specification for sed that allows th...
What are inline namespaces for?
...udes V100.h. You also modify Mine.h at the same time, of course, to add an extra include. Mine.h is part of the library, not part of the client code.
– Steve Jessop
Jun 13 '12 at 14:01
...
What is uint_fast32_t and why should it be used instead of the regular int and uint32_t?
...ven addressable. In such a case working on them requires additional ops to extract the 32-bits from, say, 64-bit aligned units. See also the linked question. C++ standard is written so that it could work on a machine that has 37-bit words... so no 32-bit type there at all.
– Ya...
Why is arr = [] faster than arr = new Array?
...Y_INIT from an object property accessor (e.g. obj[foo]) or brackets inside strings/regex literals (e.g. "foo[]bar" or /[]/)
This is miniscule, but we also have more tokens with new Array. Furthermore, it's not entirely clear yet that we simply want to create an array. We see the "new" token, but "...
Error handling in Bash
...IFS='
'
#
# Substring: I keep only the carriage return
# (others needed only for tabbing purpose)
IFS=${IFS:0:1}
local lines=( $_backtrace )
IFS=$mem
...
How to exclude certain directories/files from git grep search
... separate list $moved. I had issues with whitespace in
# the search-string, so this is loosely based on:
# http://www.linuxjournal.com/content/bash-preserving-whitespace-using-set-and-eval
x=1 ...
Simple way to transpose columns and rows in SQL?
...ate the list of items to UNPIVOT and PIVOT. This is then added to a query string to be executed. The plus of the dynamic version is if you have a changing list of colors and/or names this will generate the list at run-time.
All three queries will produce the same result:
| NAME | RED | GREEN | BL...
Creating JS object with Object.create(null)?
... in the map that you never inserted. For example, if you did a lookup on toString, you would find a function, even though you never put that value there. You can work around that like this:
if (Object.prototype.hasOwnProperty.call(p, 'toString')) {
// we actually inserted a 'toString' key into p...