===== Coding best practice in Rust =====

There are several ways to implement the same approach in Rust. Here we collect implementation details for different usecases to provide useful examples.

==== 1.1. Get value of an Option<T> or return with error if it is None: ====

<code rs>
use anyhow::{anyhow, Result};

fn function_1_1() -> Result<()> {
...
    let opt = Some(1);
    let value = opt.ok_or(anyhow!("Error message"))?;
...
}
</code>

==== 1.2. Get value of an Option<T> and perform an additional operation on it or return an error if it is None: ====


<code rs>
use anyhow::{anyhow, Result};
use rust_decimal::Decimal;

fn function_1_2() -> Result<()> {
...
    let opt = Some(1.2);
    let value: Decimal = match opt {
        Some(v) => v.try_into()?,
        None => anyhow::bail!("Error message"),
    };

</code>

==== 1.3. Write error into log if a function returning an Err as Result<T>: ====

<code rs>
use anyhow::{anyhow, Result};
use log;

fn function_returns_result() -> Result<()> {..}

if let Err(e) = function_returns_result() {
    log::debug!("Error: {}", e)
};
</code>