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View Code? Open in Web Editor NEWmini ebook - belajar bahasa pemrograman Rust
Home Page: https://belajar-rust.vercel.app/
License: MIT License
mini ebook - belajar bahasa pemrograman Rust
Home Page: https://belajar-rust.vercel.app/
License: MIT License
Halo, saya mencoba kode sub bab Associated Functions di bab Struct.
impl People {
fn count_income(d: i32, i: i32) -> People {
People { days: d, income: i }
}
}
fn main() {
let show = People::count_income(30, 3000);
println!("{:#?}", show);
}
Saat saya menjalankan kode di atas tidak berhasil karena modul People
tidak dideklarasikan. Berikut screenshotnya.
Saya mencoba mendeklarasikan struct People
sebelum kode impl
People seperti di bawah ini.
struct People;
impl People {
fn count_income(d: i32, i: i32) -> People {
People { days: d, income: i }
}
}
fn main() {
let show = People::count_income(30, 3000);
println!("{:#?}", show);
}
Namun, saat saya jalankan tidak berhasil karena People
tidak memiliki field days
dan income
. Berikut screenshotnya.
Kemudian, saya coba menambahkan field days
dan income
di struct People
kode masih tidak bisa dijalankan karena masalah formatting.
struct People {
days: i32,
income: i32
}
impl People {
fn count_income(d: i32, i: i32) -> People {
People { days: d, income: i }
}
}
fn main() {
let show = People::count_income(30, 3000);
println!("{:#?}", show);
}
Akhirnya, saya coba tambahkan #[derive(Debug)]
di atas struct People
barulah berjalan sesuai dengan ekspektasi.
#[derive(Debug)]
struct People {
days: i32,
income: i32
}
impl People {
fn count_income(d: i32, i: i32) -> People {
People { days: d, income: i }
}
}
fn main() {
let show = People::count_income(30, 3000);
println!("{:#?}", show);
}
Saya penasaran mengapa saya harus mendefinisikan struct People
lagi? Padahal di dalam impl People
sudah mendefinisikan struct People
secara tidak langsung.
Cc mas @adiatma, @ri7nz, @kevanantha
Terima kasih.
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