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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 check if variable's type matches Type stored in a variable
How do I test if some variable is of some type in this way?
4 Answers
4
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Javascript: How to detect if browser window is scrolled to bottom?
I need to detect if a user is scrolled to the bottom of a page. If they are at the bottom of the page, when I add new content to the bottom, I will automatically scroll them to the new bottom. If they are not at the bottom, they are reading previous content higher on the page, so I don't want to aut...
How can I tell when HttpClient has timed out?
As far as I can tell, there's no way to know that it's specifically a timeout that has occurred. Am I not looking in the right place, or am I missing something bigger?
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How to check if a file exists in a folder?
I need to check if an xml file exists in the folder.
9 Answers
9
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How do you check if a JavaScript Object is a DOM Object?
...t. This code is tested in FF3, IE7, Chrome 1 and Opera 9).
//Returns true if it is a DOM node
function isNode(o){
return (
typeof Node === "object" ? o instanceof Node :
o && typeof o === "object" && typeof o.nodeType === "number" && typeof o.nodeName==="string"
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How to test if one java class extends another at runtime?
How to I test if a is a subclass of b ?
3 Answers
3
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Getting a better understanding of callback functions in JavaScript
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You can just say
callback();
Alternately you can use the call method if you want to adjust the value of this within the callback.
callback.call( newValueForThis);
Inside the function this would be whatever newValueForThis is.
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How to enable/disable bluetooth programmatically in android
...toothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter.isEnabled()) {
mBluetoothAdapter.disable();
}
For this to work, you must have the following permissions:
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission ...