Function ethers::core::utils::parse_units

pub fn parse_units<K, S>(
    amount: S, 
    units: K
) -> Result<U256, Box<dyn Error + 'static, Global>> where
    S: ToString,
    K: Into<Units>, 

Multiplies the provided amount with 10^{units} provided.

use ethers_core::{types::U256, utils::parse_units};
let amount_in_eth = U256::from_dec_str("15230001000000000000").unwrap();
let amount_in_gwei = U256::from_dec_str("15230001000").unwrap();
let amount_in_wei = U256::from_dec_str("15230001000").unwrap();
assert_eq!(amount_in_eth, parse_units("15.230001000000000000", "ether").unwrap());
assert_eq!(amount_in_gwei, parse_units("15.230001000000000000", "gwei").unwrap());
assert_eq!(amount_in_wei, parse_units("15230001000", "wei").unwrap());

Example of trying to parse decimal WEI, which should fail, as WEI is the smallest ETH denominator. 1 ETH = 10^18 WEI.

use ethers_core::{types::U256, utils::parse_units};
let amount_in_wei = U256::from_dec_str("15230001000").unwrap();
assert_eq!(amount_in_wei, parse_units("15.230001000000000000", "wei").unwrap());