Function envmnt::get_set

pub fn get_set(key: &str, value: &str) -> Option<String>

Sets the environment variable value and returns the previous value.

Arguments

• key - The environment variable name
• value - The environment variable value

Example

extern crate envmnt;

fn main() {
    let pre_value = envmnt::get_set("MY_ENV_VAR", "SOME VALUE");

    let value = envmnt::get_or("MY_ENV_VAR", "DEFAULT_VALUE");
    println!("New Env Value: {}", &value);
    println!("Previous Env Value: {:?}", &pre_value);
}