Recursive reduce --es6 tail call optmized

recursiveReduce.js

// Recursive implementation of reduce
// Supports ES6 interpreter Tail Call Optimization
// http://www.ecma-international.org/ecma-262/6.0/#sec-tail-position-calls
// https://kangax.github.io/compat-table/es6/#test-proper_tail_calls_(tail_call_optimisation)

function recursiveReduce(list, callback, accumulator) {
  if (list.length === 0) return accumulator;

  accumulator === undefined ? 
    accumulator = list[0] :
    accumulator = callback(accumulator, list[0]);
  
  return recursiveReduce(list.slice(1), callback, accumulator);
};