The goodness of dynamic language

One feature that almost every dynamic language, such as Ruby, is the ability to construct expression and evaluate it at runtime.

Example:

D:\sandbox\InstantRails-2.0-win\rails_apps>irb
irb(main):001:0> a = 1
=> 1
irb(main):002:0> b = 2
=> 2
irb(main):003:0> c = "a + b"
=> "a + b"
irb(main):004:0> d = eval(c)
=> 3

I'm sure, this feature will significantly provide more solutions to every problem encountered during application development.

Howto rollback revision in svn (the simple stupid way)

Suppose you have some files with revision number 123, and then you realize that you need to revert to the previous revision (for example revision 120) and reflect the reversion changes to the server. Here's how you should do it:

1. Update those files you want to revert on your working copy to the previous revision.
   svn update --revision 120
2. Copy those files to a temporary directory
3. Update to the latest revision
   svn update
4. Then overwrite the latest revision with the files in the temporary directory
5. And then commit them back
6. Voila! you have your files reverted back to revision 120 in the new revision, e.g. revision 124

It's simpler than using svn merge and diff-ing those files one by one.

Iklan Layanan Masyarakat Linux

Masih menggunakan fasilitas Search for Files-nya Ubuntu untuk mencari dokumen-dokumen anda yang bertebaran di mana-mana?

Tinggalkan cara lama dan gunakan Tracker. Aplikasi ini akan mengindex semua file yang ada di direktori-direktori yang anda pilih.

Cara menggunakannya?
Tinggal klik tray icon "kaca pembesar" di pojok kanan atas, masukkan keyword klik Search dan voila! semua file-file yang memiliki nama atau isi sesuai keyword akan tampil dalam hitungan 1 detik.