大约有 40,000 项符合查询结果（耗时：0.0335秒） [XML]
Better way to check variable for null or empty string?
...
I'll humbly accept if I'm wrong, but I tested on my own end and found that the following works for testing both string(0) "" and NULL valued variables:
if ( $question ) {
// Handle success here
}
Which could also be reversed to test for success as such:
if ...
Git commits are duplicated in the same branch after doing a rebase
... error, and then proceeded to run git pull:
To git@bitbucket.org:username/test1.git
! [rejected] dev -> dev (non-fast-forward)
error: failed to push some refs to 'git@bitbucket.org:username/test1.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its ...
ruby inheritance vs mixins
...leton class of the object:
module M
def m
puts 'm'
end
end
class Test
end
Test.extend M
Test.m
We can access the singleton class with the singleton_class method:
Test.singleton_class.ancestors
=> [#<Class:Test>, M, #<Class:Object>, ...
Ruby provides some hooks for mod...
Error: could not find function … in R
...lly run a script that just loads every package needed and does some little test. This catches the package issue as early as possible in the workflow. This is akin to build testing or unit testing, except it's more like a smoke test to make sure that the very basic stuff works.
If packages can be s...
Scroll to the top of the page using JavaScript?
...
Can someone test this on Safari or Internet Explorer and see if it's working fine? Thanks
– Fabio Magarelli
Mar 26 at 10:23
...
How can I redirect HTTP requests made from an iPad?
...
Another, easier way to do this is with a tool I wrote: testProxy. No configuration necessary: github.com/edwinm/testProxy
– edwin
May 11 '17 at 17:27
...
Cryptic “Script Error.” reported in Javascript in Chrome and Firefox
...s why browsers shouldn't allow any data to cross domain boundaries.)
I've tested this in the latest versions of Safari, Chrome, and Firefox - they all do this. IE9 does not - it treats x-origin exceptions the same as same-origin ones. (And Opera doesn't support onerror.)
From the horses mouth: W...
How do I tell if a regular file does not exist in Bash?
...
The test command ([ here) has a "not" logical operator which is the exclamation point (similar to many other languages). Try this:
if [ ! -f /tmp/foo.txt ]; then
echo "File not found!"
fi
...
PHP's array_map including keys
...
Not with array_map, as it doesn't handle keys.
array_walk does:
$test_array = array("first_key" => "first_value",
"second_key" => "second_value");
array_walk($test_array, function(&$a, $b) { $a = "$b loves $a"; });
var_dump($test_array);
// array(2) {
// ["...
Best way to display decimal without trailing zeroes
...ix that problem. So for formatting decimals, G29 is the best bet.
decimal test = 20.5000m;
test.ToString("G"); // outputs 20.5000 like the documentation says it should
test.ToString("G29"); // outputs 20.5 which is exactly what we want
...