One lame autoCurry implementation

autocurry.js

function auto_curry(f) {
  
  return function() {
    var args = [];
    args.push.apply(args, arguments);
    
    var next = function() {
      args.push.apply(args, arguments);
      if (f.length === args.length) {
        return f.apply(this, args);
      } else {
        return next;
      }
    };
    
    if (f.length === args.length) {
        return f.apply(this, args);
      } else {
        return next;
      }
  };
  
}


function sum(a,b){
  return a + b;
}

var asum = auto_curry(sum);

document.body.innerHTML = asum(1)(4) + asum(1, 4);