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The performance impact of using instanceof in Java
...now that OO design generally tries to avoid using instanceof , that is a different story and this question is purely related to performance. I was wondering if there is any performance impact? Is is just as fast as == ?
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What's the canonical way to check for type in Python?
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To check if o is an instance of str or any subclass of str, use isinstance (this would be the "canonical" way):
if isinstance(o, str):
To check if the type of o is exactly str (exclude subclasses):
if type(o) is str:
The followi...
Access-Control-Allow-Origin error sending a jQuery Post to Google API's
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I solved the Access-Control-Allow-Origin error modifying the dataType parameter to dataType:'jsonp' and adding a crossDomain:true
$.ajax({
url: 'https://www.googleapis.com/moderator/v1/series?key='+key,
data: myData,
type: 'GET',
crossDomain: true,
data...
How to dismiss a Twitter Bootstrap popover by clicking outside?
...click', function (e) {
//did not click a popover toggle or popover
if ($(e.target).data('toggle') !== 'popover'
&& $(e.target).parents('.popover.in').length === 0) {
$('[data-toggle="popover"]').popover('hide');
}
});
For buttons containing icons use (this code...
Backbone.js: get current route
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If you have instantiated a Router in your application, the following line returns the current fragment:
Backbone.history.getFragment();
From the Backbone.js documentation:
"
[...]
History serves as a global router (per fr...
How to check if a float value is a whole number
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To check if a float value is a whole number, use the float.is_integer() method:
>>> (1.0).is_integer()
True
>>> (1.555).is_integer()
False
The method was added to the float type in Python 2.6.
Take into account t...
JPA getSingleResult() or null
...pdate method which inserts an Entity when it doesn't exist or update it if it does. To enable this, I have to findByIdAndForeignKey , if it returned null insert if not then update. The problem is how do I check if it exists? So I tried getSingleResult . But it throws an exception if the
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How to get city name from latitude and longitude coordinates in Google Maps?
How might I obtain the city name in Google Maps if I have latitude and longitude coordinates of a town or area?
15 Answers
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The necessity of hiding the salt for a hash
...ser name or phone number to salt the hash. Essentially something that is different for each user but is readily available to us. The other product randomly generates a salt for each user and changes each time the user changes the password. The salt is then encrypted in the database.
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What is the difference between a field and a property?
In C#, what makes a field different from a property, and when should a field be used instead of a property?
32 Answers
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