checked_sub

string_calc

Function checked_sub 

Source 
pub fn checked_sub(
    lhs: impl Into<String>,
    rhs: impl Into<String>,
) -> Result<String, &'static str>
Expand description

Performs checked_sub on floating points. Inherits the checked_sub property of rust in integers. When failed, it’ll return Err(message). Success, Ok(value).

NOTE: Must use basic numbers UTF-8 or it’ll fail.

Example:

let lhs = "192.168";
let rhs = "172.28";
 
assert_eq!(string_calc::checked_sub(lhs, rhs).unwrap(),
  "19.888".to_owned());