Field init shorthand is a Rust syntax that allows you to omit the `:` when initializing a struct field with the same name as a variable.
fn build_user(email: String, username: String) -> User {
User {
active: true,
username,
email,
sign_in_count: 1,
}
}
As you can see, the `email` field is now initialized with the `email` parameter without the need for the `:`. This makes the code more concise and easier to read.
Note
- It can only be used when the struct field name and the variable name are exactly the same.
- It cannot be used when the struct field name and the variable name are only similar. For example, you cannot use field init shorthand to initialize a `username` field with a `user_name` variable.
- It cannot be used when the struct field name and the variable name are different but have the same meaning. For example, you cannot use field init shorthand to initialize a `date_of_birth` field with a `birthdate` variable.
