rhai 1.3.0

Embedded scripting for Rust
Documentation 
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// This script defines a function with two parameters

let a = 3;

fn addme(a, b) {
    a = 42;             // notice that 'a' is passed by value
    a + b;              // notice that the last value is returned even if terminated by a semicolon
}

let result = addme(a, 4);

print(`addme(a, 4) should be 46: ${result}`);

print(`a should still be 3: ${a}`);     // should print 3 - 'a' is never changed