Takes a basic lambda calculus expression in the form e.g.
lx.ly.x or λx.λy.x
and an optional value to apply, and returns the stringified function in JavaScript, or the determined value.
Values are given as command-line arguments:
npm start λx.λy.y
returns (x => y => (y))
The tool can apply basic unbound variables, as long as enough are supplied:
npm start λx.x 2
returns 2
npm start λx.λy.x 5 6
returns 5