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Collections.emptyList() vs. new instance
...inal <T> List<T> emptyList() {
return (List<T>) EMPTY_LIST;
}
So if your method (which returns an empty list) is called very often, this approach may even give you slightly better performance both CPU and memory wise.
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More elegant “ps aux | grep -v grep”
...e grepped character: ps aux| grep "te[r]minal"
– meso_2600
Mar 23 '16 at 9:54
2
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SQL injection that gets around mysql_real_escape_string()
Is there an SQL injection possibility even when using mysql_real_escape_string() function?
4 Answers
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Equivalent of *Nix 'which' command in PowerShell?
...on for the Which function:
function which($cmd) { get-command $cmd | % { $_.Path } }
PS C:\> which devcon
C:\local\code\bin\devcon.exe
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JavaScript variable number of arguments to function
... you can accept variable number of arguments with this syntax:
function my_log(...args) {
// args is an Array
console.log(args);
// You can pass this array as parameters to another function
console.log(...args);
}
Here's a small example:
function foo(x, ...args) {
console.l...
How to take a screenshot programmatically on iOS
...iOS7 or above
- (UIImage *) screenshot {
CGSize size = CGSizeMake(your_width, your_height);
UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);
CGRect rec = CGRectMake(0, 0, your_width, your_height);
[_viewController.view drawViewHierarchyInRect:rec afte...
How to obtain the query string from the current URL with JavaScript?
...href);
myfunction("http://www.myname.com/index.html?id=dance&emp;cid=in_social_facebook-hhp-food-moonlight-influencer_s7_20160623");
here is the fiddle
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join list of lists in python [duplicate]
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import itertools
a = [['a','b'], ['c']]
print(list(itertools.chain.from_iterable(a)))
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Graphviz: How to go from .dot to a graph?
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1. Install Graphviz from graphviz.gitlab.io/_pages/Download/Download_windows.html 2. Add 'C:\Program Files (x86)\Graphviz2.38\bin' to your system variable PATH 3. Open cmd and go to the dir where you saved the .dot file 4. Use the command 'dot yourFile.dot -Tpng -o i...
Android: Clear the back stack
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Try adding FLAG_ACTIVITY_NEW_TASK as described in the docs for FLAG_ACTIVITY_CLEAR_TOP:
This launch mode can also be used to
good effect in conjunction with
FLAG_ACTIVITY_NEW_TASK: if used to
start the root activity of a task, it
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