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Detect If Browser Tab Has Focus
...cause it runs the risk of overriding some other event listener in a larger application. You should instead follow this answer: stackoverflow.com/a/21935031/549503
– mmmeff
Sep 21 '18 at 22:32
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How to remove the first character of string in PHP?
...a string, you can use ltrim:
$str = '::f:o:';
$str = ltrim($str, ':');
var_dump($str); //=> 'f:o:'
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How to get an array of unique values from an array containing duplicates in JavaScript? [duplicate]
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With underscorejs
_.uniq([1, 2, 1, 3, 1, 4]); //=> [1, 2, 3, 4]
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Inline labels in Matplotlib
In Matplotlib, it's not too tough to make a legend ( example_legend() , below), but I think it's better style to put labels right on the curves being plotted (as in example_inline() , below). This can be very fiddly, because I have to specify coordinates by hand, and, if I re-format the plot, I pro...
Does the C++ standard mandate poor performance for iostreams, or am I just dealing with a poor imple
...ode compiled with GCC gives the following breakdown:
44.23% in std::basic_streambuf<char>::xsputn(char const*, int)
34.62% in std::ostream::write(char const*, int)
12.50% in main
6.73% in std::ostream::sentry::sentry(std::ostream&)
0.96% in std::string::_M_replace_safe(unsigned int, unsi...
Convert character to ASCII code in JavaScript
...ly this is documented: developer.mozilla.org/en/JavaScript/Reference/Global_Objects/…. "if it is not a number, it defaults to 0"
– tokland
Nov 15 '11 at 19:46
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Auto code completion on Eclipse
... I think adding the Capital letters would be handy. I have added ._@abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
– Md. Abu Nafee Ibna Zahid
Jul 2 '18 at 11:22
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User recognition without cookies or local storage
...as $name => &$profile) {
// Use shorter labels
$data = array_combine($labels, $profile->data);
if ($perceptron->testCase($data, $trainResult) == true) {
$score = $diff = 0;
// Determing the score and diffrennce
foreach ($unknown->data as $item =&g...
What is the difference between a definition and a declaration?
...declares foo
}
... or is a typedef or using statement.
typedef long LONG_32; // declares LONG_32
using namespace std; // declares std
Now for the big reason why it's important to understand the difference between a declaration and definition: the One Definition Rule. From section 3.2.1 of t...
find() with nil when there are no records
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Yes, just do:
Challenge.find_by_id(10)
For Rails 4 and 5:
Challenge.find_by(id: 10)
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