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Measuring function execution time in R
...en <- end.time - start.time
time.taken
Not the most elegant way to do it, compared to the answere above , but definitely a way to do it.
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Android gradle: buildtoolsVersion vs compileSdkVersion
...ript compiler, etc...) that you want to use. For each API level (starting with 18), there is a matching .0.0 version.
At IO 2014, we release API 20 and build-tools 20.0.0 to go with it.
Between Android releases we will release updates of the compilers, and so we'll release version .0.1, .0.2, etc....
JOIN queries vs multiple queries
...his is way too vague to give you an answer relevant to your specific case. It depends on a lot of things. Jeff Atwood (founder of this site) actually wrote about this. For the most part, though, if you have the right indexes and you properly do your JOINs it is usually going to be faster to do 1 tri...
Conditionally ignoring tests in JUnit 4
...
The JUnit way is to do this at run-time is org.junit.Assume.
@Before
public void beforeMethod() {
org.junit.Assume.assumeTrue(someCondition());
// rest of setup.
}
You can do it in a @Before method or in the test its...
How do I deserialize a JSON string into an NSDictionary? (For iOS 5+)
...
It looks like you are passing an NSString parameter where you should be passing an NSData parameter:
NSError *jsonError;
NSData *objectData = [@"{\"2\":\"3\"}" dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [N...
Shell - How to find directory of some command?
... a builtin, a function, an alias or an external executable. If the latter, it will show each place it appears in your PATH.
bash$ type -a lshw
lshw is /usr/bin/lshw
bash$ type -a ls
ls is aliased to `ls --color=auto'
ls is /bin/ls
bash$ zsh
zsh% type -a which
which is a shell builtin
which is /usr/...
Unable to load Private Key. (PEM routines:PEM_read_bio:no start line:pem_lib.c:648:Expecting: ANY PR
...
Open the key file in Notepad++ and verify the encoding. If it says UTF-8-BOM then change it to UTF-8. Save the file and try again.
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How do I add comments to package.json for npm install?
... for comments ... If you want to use a multiple line comment, you can use either an array, or multiple "//" keys.
When using your usual tools (npm, yarn, etc) multiple "//" keys will be removed. This survives:
{ "//": [
"first line",
"second line" ] }
This will not survive:
{ "//": "thi...
Remove leading comma from a string
... be the result you're looking for though because you will still need to split it to create an array with it. Maybe something like:
var myString = myOriginalString.substring(1);
var myArray = myString.split(',');
Keep in mind, the ' character will be a part of each string in the split here.
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Create a dictionary with list comprehension
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Use a dict comprehension:
{key: value for (key, value) in iterable}
Note: this is for Python 3.x (and 2.7 upwards). Formerly in Python 2.6 and earlier, the dict built-in could receive an iterable of key/value pairs, so you can pass it a list comprehension or generator expression. ...