mirror of
https://github.com/rust-lang/rustlings.git
synced 2026-05-15 09:48:45 +00:00
97a723508c
Learners were sometimes confused by the literal array. Their assumption was that they are supposed to convert the array to a vector. Duplicating the literal elements was not an intuitive solution. This redesign avoids putting an identical array literal near the place where learners are supposed to use the vec! macro.
Vectors
Vectors are one of the most-used Rust data structures. In other programming languages, they'd simply be called Arrays, but since Rust operates on a bit of a lower level, an array in Rust is stored on the stack (meaning it can't grow or shrink, and the size needs to be known at compile time), and a Vector is stored in the heap (where these restrictions do not apply).
Vectors are a bit of a later chapter in the book, but we think that they're useful enough to talk about them a bit earlier. We shall be talking about the other useful data structure, hash maps, later.