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How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
...ar map= Map.empty[Any,(Manifest[_], Any)]
def register[T](name: Any, item: T)(implicit m: Manifest[T]) {
map = map.updated(name, m -> item)
}
def get[T](key:Any)(implicit m : Manifest[T]): Option[T] = {
map get key flatMap {
case (om, s) => if (om <:< m) Some(s...
What is the difference between Directory.EnumerateFiles vs Directory.GetFiles?
...he whole collection first in memory is too heavy. You can just process the items as they come and forget them.
– Stéphane Gourichon
Jan 7 '16 at 18:49
1
...
How to use UIScrollView in Storyboard
...rollView !), and set its Y position to for example -250, so you can add an item that is 'outside' the screen
Drop in a label, somewhere at the bottom of the screen, name it 'label 2'. This label is actually 'off screen'.
Reset the Y position of the enclosing view to 0, you'll no longer see label 2,...
Linking static libraries to other static libraries
...dd the other libraries you want combined with X (Right Click, Add Existing Item...).
Go to their properties and make sure Item Type is Library
This will include the other libraries in X as if you ran
lib /out:X.lib X.lib other1.lib other2.lib
...
Get a list of distinct values in List
...ive some performance benefit, if we doesn't care about order and have more items in the list.
– Sai
Oct 22 '15 at 20:58
1
...
Ant task to run an Ant target only if a file exists?
...use
property expansion; a value of true
(or on or yes) will enable the item,
while false (or off or no) will
disable it. Other values are still
assumed to be property names and so
the item is enabled only if the named
property is defined.
Compared to the older style, this
gives ...
Any reason not to use '+' to concatenate two strings?
...re, especially if it is growing. With list you can use list.extend(list_of_items) and list.append(item) which are much faster when concatenating stuff dynamically.
– Antti Haapala
Sep 11 '12 at 9:56
...
How to combine two or more querysets in a Django view?
...being faster, but I didn't see a noticeable speed difference for a million item list.
from operator import attrgetter
result_list = sorted(
chain(page_list, article_list, post_list),
key=attrgetter('date_created'))
...
How to convert URL parameters to a JavaScript object?
... 1) {
var levels = [];
structure.forEach(function (item, i) {
var key = item.replace(/[?[\]\\ ]/g, '');
levels.push(key);
});
assign(params, levels, params[prop]);
delete(params[prop]);
}
}
re...
How to get the class of the clicked element?
...
It's ui.tab instead of ui.item you need to use. I thought it was ui.item.
– jeroen.verhoest
Jul 13 '09 at 8:41
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