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Facebook database design?
I have always wondered how Facebook designed the friend user relation.
13 Answers
13
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Android: How to enable/disable option menu item on button click?
...tionsMenu() method is called
only once, as described above. The
system keeps and re-uses the Menu you
define in this method until your
activity is destroyed. If you want to
change the Options Menu any time after
it's first created, you must override
the onPrepareOptionsMenu() method.
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Installing a local module using npm?
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From the npm-link documentation:
In the local module directory:
$ cd ./package-dir
$ npm link
In the directory of the project to use the module:
$ cd ./project-dir
$ npm link package-name
Or in one go using relative paths:
$ cd ./p...
Detect If Browser Tab Has Focus
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Yes, window.onfocus and window.onblur should work for your scenario:
http://www.thefutureoftheweb.com/blog/detect-browser-window-focus
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When do we need curly braces around shell variables?
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In this particular example, it makes no difference. However, the {} in ${} are useful if you want to expand the variable foo in the string
"${foo}bar"
since "$foobar" would instead expand the variable identified by foobar.
Curly braces are also unconditi...
Why is there a difference in checking null against a value in VB.NET and C#?
...r the VB.NET semantics, which in essence gives NULL the semantics "I don't know yet". Then the comparison of 5 to "I don't know yet". is naturally "I don't know yet"; ie NULL. This has the additional advantage of mirroring the behaviour of NULL in (most if not all) SQL databases. This is also a more...
How to get a Fragment to remove itself, i.e. its equivalent of finish()?
...ber of activities (A B C D) which chain onto one another, D has a button 'OK' which when pressed calls finish which then bubbles up through onActivityResult() to additionally destroy C and B.
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Formatting a float to 2 decimal places
...I have got the sale price to calculate perfectly but where I have come stuck is formatting the output to 2 decimal places.
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Your branch is ahead of 'origin/master' by 3 commits
...You have several ways to "solve" it and it normally depends on how your workflow looks like:
In a good workflow your remote copy of master should be the good one while your local copy of master is just a copy of the one in remote. Using this workflow you'll never get this message again.
If you wor...
Concat scripts in order with Gulp
Say, for example, you are building a project on Backbone or whatever and you need to load scripts in a certain order, e.g. underscore.js needs to be loaded before backbone.js .
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