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Why does Haskell's “do nothing” function, id, consume tons of memory?
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We know the type of id,
id :: a -> a
And when we specialize this for id id, the left copy of id has type:
id :: (a -> a) -> (a -> a)
And then when you specialize this again for the leftmost id in id id id, you get:
id :: ((a -> a) -> (a -> a)) -> ((a -> a) -> ...
How to prevent form resubmission when page is refreshed (F5 / CTRL+R)
I have a simple form that submits text to my SQL table. The problem is that after the user submits the text, they can refresh the page and the data gets submitted again without filling the form again. I could redirect the user to another page after the text is submitted, but I want users to stay on ...
Remove the error indicator from a previously-validated EditText widget
I am using an EditText widget, and I am validating it with the setError() method of EditText and it validates correctly.
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Cross compile Go on OSX?
I am trying to cross-compile a go app on OSX to build binaries for windows and linux. I have read everything what I could find on the net. Closest example that I have found has been published on (apart from many unfinished discussions on go-nuts mailing list):
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What does the property “Nonatomic” mean?
...e Apple Docs.
Basically, if you say nonatomic, and you generate the accessors using @synthesize, then if multiple threads try to change/read the property at once, badness can happen. You can get partially-written values or over-released/retained objects, which can easily lead to crashes. (This is p...
Google Maps API v3: How to remove all markers?
...markersArray = [];
II. Define a function:
function clearOverlays() {
for (var i = 0; i < markersArray.length; i++ ) {
markersArray[i].setMap(null);
}
markersArray.length = 0;
}
OR
google.maps.Map.prototype.clearOverlays = function() {
for (var i = 0; i < markersArray.length; ...
Update all values of a column to lowercase
...answered May 28 '11 at 9:53
RippoRippo
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How to jump to a specific character in vim?
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You can type f<character> to put the cursor on the next character and F<character> for the previous one.
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Getting value of public static final field/property of a class in Java via reflection
...value. If you know the type you can use one of the get methods with null (for static fields only, in fact with a static field the argument passed to the get method is ignored entirely). Otherwise you can use getType and write an appropriate switch as below:
Field f = R.class.getField("_1st");
Class...
Java synchronized method lock on object, or method?
...ccess those 2 methods at the same time? Does the lock occur on the object, or does it get as specific as the variables inside the synchronized method?
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