drwelby

The SBN spatial index is some sort of binary range tree. I've been pretty close in reproducing the indexing by using a tree method, where the input bounding box is sorted through a tree structure by alternately comparing min/max coordinate pair against each division.

However, it's always seemed like there would be some faster way to sort features based on looking at individual bits in the binary representation of the coordinate value.

For example, let's say we have a 4 bit index space ( a 16 x 16 grid). We're trying to bin a bounding box with a max coordinate of (11,9) and min of (8,7).

Using the tree method, we would first look at the first split which occurs at an x of 8. Since xmin is equal to or greater than 8 that would sort the bounding box into the right bin. Next we would look at a y value of 8 for the second division. In this case the y value splits the bounding box, so the box cannot be sorted further and remains in the third bin.

We can also do this bitwise. What we first do is reverse the bin

possibilities

From Meteor's documentation:

In Meteor, your server code runs in a single thread per request, not in the asynchronous callback style typical of Node. We find the linear execution model a better fit for the typical server code in a Meteor application.

This guide serves as a mini-tour of tools, trix and patterns that can be used to run async code in Meteor.

Basic async

Sometimes we need to run async code in Meteor.methods. For this we create a Future to block until the async code has finished. This pattern can be seen all over Meteor's own codebase:

AndrewRadev

# Detects classes, static/class methods, plain functions and variables.
# To use, place it in a ~/.ctags file.

--langdef=coffee
--langmap=coffee:.coffee
--regex-coffee=/(^|=[ \t])*class ([A-Za-z.]+)( extends [A-Za-z.]+)?$/\2/c,class/
--regex-coffee=/^[ \t]*(module\.)?(exports\.)?@?([A-Za-z.]+):.*[-=]>.*$/\3/f,function/
--regex-coffee=/^[ \t]*(module\.)?(exports\.)?([A-Za-z.]+)[ \t]+=.*[-=]>.*$/\3/f,function/
--regex-coffee=/^[ \t]*([A-Za-z.]+)[ \t]+=[^->\n]*$/\1/v,variable/

Jaybles

//
//  UIDeviceHardware.h
//
//  Used to determine EXACT version of device software is running on.

#import <Foundation/Foundation.h>

@interface UIDeviceHardware : NSObject 

- (NSString *) platform;