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How can I check for “undefined” in JavaScript? [duplicate]
...e undefined, then use the typeof operator, which is guaranteed to return a string:
if (typeof myVar !== 'undefined')
Direct comparisons against undefined are troublesome as undefined can be overwritten.
window.undefined = "foo";
"foo" == undefined // true
As @CMS pointed out, this has been pa...
Remove a HTML tag but keep the innerHtml
...h(function() { return $(this).contents(); });
Or if you know it's just a string:
$("b").replaceWith(function() { return this.innerHTML; });
This can make a big difference if you're unwrapping a lot of elements since either approach above is significantly faster than the cost of .unwrap().
...
Is there a 'foreach' function in Python 3?
...nt:
// PHP:
foreach ($array as $val) {
print($val);
}
// C#
foreach (String val in array) {
console.writeline(val);
}
// Python
for val in array:
print(val)
So, yes, there is a "foreach" in python. It's called "for".
What you're describing is an "array map" function. This could be ...
Echo a blank (empty) line to the console from a Windows batch file [duplicate]
... @MatteoItalia, It's nothing to do with speed. If it's doing something extra (search first for a file named echo without extension) then it's wrong and if there's a file as such, it'll indeed fail. Extra points if the batchjob fails on a weekend while everyone is partying hard half-a-country awa...
PHP code to remove everything but numbers
I'm trying to remove everything from a string but just numbers (0-9).
4 Answers
4
...
PHP “php://input” vs $_POST
...a lot, this probaby also includes exchanging more complex data with types (string, int, bool) and structures (arrays, objects), so in most cases JSON is the best choice. But a request with a JSON-payload would look something like this:
POST /page.php HTTP/1.1
{"key1":"value1","key2":"value2","key3...
How to get the raw value an field?
...zation algorithm says the browser is supposed to set the value to an empty string if the input isn't a valid floating point number.
The value sanitization algorithm is as follows: If the value of the
element is not a valid floating-point number, then set it to the empty
string instead.
By ...
What is the best way to determine the number of days in a month with JavaScript?
...
To take away confusion I would probably make the month string based as it is currently 1 based.
function daysInMonth(month,year) {
monthNum = new Date(Date.parse(month +" 1,"+year)).getMonth()+1
return new Date(year, monthNum, 0).getDate();
}
daysInMonth('feb', 2015)
/...
What programming practice that you once liked have you since changed your mind about? [closed]
...ian notation (both Forms and Systems).
I used to prefix everything. strSomeString or txtFoo.
Now I use someString and textBoxFoo. It's far more readable and easier for someone new to come along and pick up. As an added bonus, it's trivial to keep it consistant -- camelCase the control and append a u...
The easiest way to transform collection to array?
...of the correct type. And in this case, honestly, I wouldn't care about one extra single empty array in my application. That's far below noise level.
– Andreas Dolk
Jul 21 '10 at 6:28
...