Programs Are Hard, Libraries Are Easy

The smaller the piece, the better.

The more flexible the piece, the better.

The more hooks into the guts, the better.

• Libraries of functions can have small, flexible pieces.

• Programs are, by definition, monolithic.

Extract pieces out of your program and put it into a library

• Then test the library

• Side-benefit, you'll have improved your code

Take the FTP, XML parsing and HTML generation code out of the program.

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