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To convert a Rust `String` to its primitive value, we can simply call the `to_string()` method on the `String` object. This will return a `String` representation of the object, which can then be converted to a primitive value using Rust’s built-in type conversion functions.
Here’s an example of how to use `to_string()` to convert a Rust `String` to a primitive value:
let my_string = String::from("Hello, world!");
let primitive_value = my_string.to_string().parse::
In this example, we first create a `String` object called `my_string` with the value “Hello, world!”. We then call the `to_string()` method on `my_string` to convert it to a `String` representation. Finally, we use Rust’s `parse()` method to convert the `String` to an `i32` primitive value.