js: recursive max and min with partial application

recursiveMinMax.js

var max = reduce(function(a, b) { return a > b; });
var min = reduce(function(a, b) { return a < b; });

function reduce(p) {
  return function(a) {
    function iter(a, c) {
      if(a.length === 0) return c;
      else return iter(a.slice(1), p(a[0], c) ? a[0] : c);
    }
    return iter(a.slice(1), a[0]);
  }
}