Creating a static const Vec<String> [duplicate]

Question

I am trying to initialize a Vec<String> with some settings that can be reused over my code.

I am using const left: Vec<String> = vec![... but this doesn't work:

error[E0308]: mismatched types
  --> names-generator.rs:2:27
   |
2  | const left: Vec<String> = vec![
   |                           ^ expected slice, found array of 93 elements
   |
   = note: expected type `Box<[std::string::String]>`
   = note:    found type `Box<[&str; 93]>`
   = note: this error originates in a macro outside of the current crate

What is the recommended way of doing something like this?

Answer 1

Do you want it to be mutable? Do the values have to be Strings? If the answer is "no" to both, you can use an array of string slices ([&str; N]) instead of a Vec<String>:

const LEFT: [&'static str; 3] = ["Hello", "World", "!"];
// or
const LEFT: &'static [&'static str] = &["Hello", "World", "!"];

consts are basically copied wherever they are used, so the second form may be preferable depending on the size of the array.