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Join strings with a delimiter only if strings are not null or empty
...
Consider
var address = "foo";
var city;
var state = "bar";
var zip;
text = [address, city, state, zip].filter(Boolean).join(", ");
console.log(text)
.filter(Boolean) (which is the same as .filter(x => x)) removes all "falsy" values ...
Set value of textarea in jQuery
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val(foo) works for me (jQuery 1.9.1). Using text(foo) loses to update textarea content loses the linebreaks on IE, using val(foo) preserves them.
– Tim
Sep 11 '13 at 9:21
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How to show changed file name only with git log? [duplicate]
...puts a list of files only and their state (added, modified, deleted):
A foo/bar/xyz/foo.txt
M foo/bor/bar.txt
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The -k2,2 option for sort, makes it sort by file path instead of the type of change (A, M, D,).
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Mercurial (hg) commit only certain files
...u can specify the files on the command line, as tonfa writes:
$ hg commit foo.c foo.h dir/
That just works and that's what I do all the time. You can also use the --include flag that you've found, and you can use it several times like this:
$ hg commit -I foo.c -I "**/*.h"
You can even use a f...
How to shuffle a std::vector?
...random_engine e(seed);
while(true)
{
std::vector<int> foo{1,2,3,4,5};
std::shuffle(foo.begin(), foo.end(), e);
std::cout << "shuffled elements:";
for (int& x: foo) std::cout << ' ' << x;
std::cout << '\n';
}
return 0...
Close file without quitting VIM application?
...ever this doesn't completely remove the buffer, it's still accessible:
:e foo
:e bar
:buffers
1 #h "foo" line 1
2 %a "bar" line 1
Press ENTER or type command to continue
:bd 2
:buffers
1 %a "foo" line 1
Press ENT...
How is the “greater than” or “>” character used in CSS?
...t would match the following <em>s:
<p><strong><em>foo</em></strong></p>
<p>Text <em>foo</em> bar</p>
On the other hand,
p > em
Will match only <em>s that are immediate children of <p>. So it will match:
<p&g...
PHP Fatal error: Cannot redeclare class
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It means you've already created a class.
For instance:
class Foo {}
// some code here
class Foo {}
That second Foo would throw the error.
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How do you create optional arguments in php?
...le or a function call.
If you need this functionality however:
function foo($foo, $bar = false)
{
if(!$bar)
{
$bar = $foo;
}
}
Assuming $bar isn't expected to be a boolean of course.
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Creating PHP class instance with a string
...s();
When using namespaces, supply the fully qualified name:
$class = '\Foo\Bar\MyClass';
$instance = new $class();
Other cool stuff you can do in php are:
Variable variables:
$personCount = 123;
$varname = 'personCount';
echo $$varname; // echo's 123
And variable functions & methods.
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