lua-monkey

lua-monkey is a lua implementation of a tree-walking interpreter for Monkey.

Extensions

My monkey implementation has been extended to support the following new features:

• Friendly error messages that display the offending line of code and underline the exact location of the error.

• arrow functions e.g let adder = fn x => fn y => x+y; adder(1)(2) let adder = fn(x,y)=> x+y

• Default parameters let add = fn (x,y=1) => x+y; add(1); //2 add(10,90); //100

• for in loops for(item,index in [1,2,3,4]){ puts(item+index)}

• Ability to run monkey files (.mo extension)

• comments (both single and multi line) // a comment! /* a multiline comment */

• Logical OR and logical AND operators

• <= and >= operators

• % operator

• String comparison

• String indexing

• more builtin functions

  • map map([1,2,3,4], fn x => x*2)
  • find find(["hello", "world"], fn w => w=="hello")
  • reduce reduce([1,2,3,4], fn(acc,curr) => acc+curr,100)
  • filter filter([1,2,3,4], fn x => x%2==0)
  • set let map = { "a": 1 }; set(map,"b",2); map["b"] //2

Run

Clone the project

  git clone https://github.com/michaelbdev/lua-monkey

Go to the project directory

  cd lua-monkey

Install dependencies

  luarocks install --only-deps  lua-monkey-0.1.0-1.rockspec

Using the REPL

   lua main.lua --repl

Run from monkey files

   lua main.lua

Run tests

   busted tests