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Getting distance between two points based on latitude/longitude
I tried implementing this formula: http://andrew.hedges.name/experiments/haversine/
The aplet does good for the two points I am testing:
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Rails Model find where not equal
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In Rails 4.x (See http://edgeguides.rubyonrails.org/active_record_querying.html#not-conditions)
GroupUser.where.not(user_id: me)
In Rails 3.x
GroupUser.where(GroupUser.arel_table[:user_id].not_eq(me))
To shorten the length, you co...
What is so special about Generic.xaml?
.... on Vista using the Aero theme, the dictionary is called Aero.NormalColor.xaml, on XP using the default theme it is Luna.NormalColor.xaml. If the style is not found in the theme dictionary, it looks in Generic.xaml i.e for controls whose look doesn't depend on the theme.
This only applies to any c...
Python hashable dicts
As an exercise, and mostly for my own amusement, I'm implementing a backtracking packrat parser. The inspiration for this is i'd like to have a better idea about how hygenic macros would work in an algol-like language (as apposed to the syntax free lisp dialects you normally find them in). Because...
CAP theorem - Availability and Partition Tolerance
... "Partition tolerance" (P) in CAP, I found it difficult to understand the explanations from various articles.
9 Answers
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What is a rune?
...stants, so their type can change). They represent unicode codepoints. For example, the rune literal 'a' is actually the number 97.
Therefore your program is pretty much equivalent to:
package main
import "fmt"
func SwapRune(r rune) rune {
switch {
case 97 <= r && r <= 122:
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What is a Lambda?
... the secrets of C# question, but I have yet to find a good definition and explanation of what they are in the first place.
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Pushing read-only GUI properties back into ViewModel
... better to create just one Size property, combining Heigth and Width. Approx. 50% less code.
– Gerard
Feb 14 '14 at 14:07
1
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Can existing virtualenv be upgraded gracefully?
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You can use the Python 2.6 virtualenv to "revirtual" the existing directory. You will have to reinstall all the modules you installed though. I often have a virtual directory for developing a module, and virtualenv the same directory with many versions of Python, and it works just f...
iTerm 2: How to set keyboard shortcuts to jump to beginning/end of line?
... following Profile Shortcut Keys
FOR ACTION SEND
⌘← "SEND HEX CODE" 0x01
⌘→ "SEND HEX CODE" 0x05
⌥← "SEND ESC SEQ" b
⌥→ "SEND ESC SEQ" f
Here is a visual for those who need it
s...