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Writing a compiler in its own language
...me other language (usually Java or C). Once that is done, you can write a new version of the compiler in language Foo. You use the first bootstrap compiler to compile the compiler, and then use this compiled compiler to compile everything else (including future versions of itself).
Most languages...
What's the difference between equal?, eql?, ===, and ==?
... end
def eql?(other) self.hash == other.hash end
end
h = {Equ.new(3) => 3, Equ.new(8) => 8, Equ.new(15) => 15} #3 entries, but 2 are :eql?
h.size # => 2
h[Equ.new(27)] # => 15
Note: The commonly used Ruby-class Set also relies on Hash-key-comparison.
...
Using CSS td width absolute, position
... Matthew BrownMatthew Brown
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Using a custom image for a UITableViewCell's accessoryView and having it respond to UITableViewDeleg
...hey now subclass OPTableViewController).
Firstly, this function returns a new detail disclosure button using our custom graphic:
- (UIButton *) makeDetailDisclosureButton
{
UIButton * button = [UIButton outpostDetailDisclosureButton];
[button addTarget: self
action: @selector(a...
Python - Check If Word Is In A String
...
fabrizioMfabrizioM
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How to pass anonymous types as parameters?
...ng ColumnName;
}
var query = (from name in some.Table
select new Data { ColumnName = name });
MethodOp(query);
...
MethodOp(IEnumerable<Data> enumerable);
In this case though, you are only selecting a single field, so it may be easier to just select the field directly. This wil...
SignalR - Sending a message to a specific user using (IUserIdProvider) *NEW 2.0.0*
In the latest version of Asp.Net SignalR, was added a new way of sending a message to a specific user, using the interface "IUserIdProvider".
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How can I display just a portion of an image in HTML/CSS?
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clip is deprecated. Newer clip-path doesn't require positioning
– eagor
Jan 15 '15 at 12:09
3
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HTML5 Video Dimensions
...nd 'height' properties.
*/
function getVideoDimensionsOf(url){
return new Promise(function(resolve){
// create the video element
let video = document.createElement('video');
// place a listener on it
video.addEventListener( "loadedmetadata", function () {
// retrieve dimension...
LINQ - Left Join, Group By, and Count
...
from j2 in j1.DefaultIfEmpty()
group j2 by p.ParentId into grouped
select new { ParentId = grouped.Key, Count = grouped.Count(t=>t.ChildId != null) }
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