How to specify output file encoding in Ruby?

Question

How can I set the encoding of a file when using a File#open?

Answer 1

Here's an example that outputs a file in the UTF-16LE encoding:

open("data.txt", "w:UTF-16LE") 

Ruby looks at the encoding of the string you are writing, and transcodes as necessary. Here's a very detailed blog post describing mechanics with excellent examples (see the section called "The Default External and Internal Encodings").