Module show_notes::e014

Stringing things along

• Date: April 24, 2016
• Subject: Strings &strs and Vecs and slices (and Unicode) -- oh, my!
• Audio

Notes

This episode, I take a deep dive on strings in Rust, looking at the differences between String and &str, discussing Unicode a bit, and then expanding the discussion to think about how these types relate to the types they're built on (like Vec).

Corrigenda

Listener Nev pointed out to me that I got it wrong when describing how &str data is stored. It is not stack-allocated, but rather goes in the data segment. I should have said statically-allocated, not stack-allocated. Thanks to Nev for the correction!

Links

• Strings:
  • The Rust Book
  • Rust by Example
  • str docs:
    • module
    • primitive type
  • String
    • module
    • type definition
• Dereferencing
  • coercions
  • std::ops::Deref

Sponsors

• Aleksey Pirogov
• Chris Palmer
• Derek Morr
• Hamza Sheikh
• Lachlan Collins
• Leif Arne Storset
• Luca Schmid
• Micael Bergeron
• Pascal Hertleif
• Ralph Giles ("rillian")
• Ralph "FriarTech" Loizzo
• reddraggone9
• Ryan Ollos
• Vesa Kaihlavirta
• William Roe

(Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!)

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Contact

• New Rustacean:
  • Twitter: @newrustacean
  • Email: [email protected]
• Chris Krycho
  • GitHub: chriskrycho
  • Twitter: @chriskrycho

Modules

demo_deref

Demonstrate dereferencing. (You'll want to read this example carefully.)

Functions

demonstrate_unicode	Print a 🚀, just because we can.
get_a_slice	Get a string slice. Note the required lifetime specifier on the type!
get_a_string	Get a String instance. Note there's no lifetime.
get_a_string_with_capacity	Get a String with a specified capacity.
get_back_some_unicode
show_from_behavior	It's easy enough to get a String from a str.