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Disable Automatic Reference Counting for Some Files
...The ARC converter doesn't work here, because some frameworks, such as JSONKit, cannot be converted to ARC by using the converter.
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Python SQL query string formatting
...ing
my application I'd like to log to file all the sql query strings, and it is
important that the string is properly formated.
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structure vs class in swift language
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Here's an example with a class. Note how when the name is changed, the instance referenced by both variables is updated. Bob is now Sue, everywhere that Bob was ever referenced.
class SomeClass {
var name: String
init(name: String) {
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How to write iOS app purely in C
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Damn, it took me a while but I got it:
main.c:
#include <CoreFoundation/CoreFoundation.h>
#include <objc/runtime.h>
#include <objc/message.h>
// This is a hack. Because we are writing in C, we cannot out and i...
Overflow-x:hidden doesn't prevent content from overflowing in mobile browsers
I have a website here .
16 Answers
16
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What's a concise way to check that environment variables are set in a Unix shell script?
..."}
: ${DEST:?"Need to set DEST non-empty"}
Or, better (see section on 'Position of double quotes' below):
: "${STATE?Need to set STATE}"
: "${DEST:?Need to set DEST non-empty}"
The first variant (using just ?) requires STATE to be set, but STATE="" (an empty string) is OK — not exactly what you ...
Node.js throws “btoa is not defined” error
...ed in node. The new directory showed up in my node_modules folder, which itself is in root alongside app.js . Then I made sure to add btoa-atob as a dependency in my package.json file which is in root.
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How can I ensure that a division of integers is always rounded up?
... blog in January 2013. Thanks for the great question!
Getting integer arithmetic correct is hard. As has been demonstrated amply thus far, the moment you try to do a "clever" trick, odds are good that you've made a mistake. And when a flaw is found, changing the code to fix the flaw without cons...
How can I safely create a nested directory?
... is the most elegant way to check if the directory a file is going to be written to exists, and if not, create the directory using Python? Here is what I tried:
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Compiling a java program into an executable [duplicate]
I've just made a simple program with Eclipse and I want to compile it into an executable, but simply can't seem to find out how to do it.
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