The asFunction and def methods evaluate function code. Here is how asFunction can be used:

let env = gololang.EvaluationEnvironment()
let code = "return (a + b) * 2"
let f = env: asFunction(code, "a", "b")
println(f(10, 20))

It evaluates straight code as the body of a function. Note that imports can be used to specify import statements to be available while evaluation the code:

env:
  imports("java.util.LinkedList", "java.util.HashMap"):
  asFunction("""let l = LinkedList()
let m = HashMap()""")

The def method is similar, except that it has the parameters definition in the code to evaluate:

let env = gololang.EvaluationEnvironment()
let code = "|a, b| -> (a + b) * 2"
let f = env: def(code)
println(f(10, 20))