Currying in Javascript

curry.js

function curry(func) {
  function curried(args) {
    return function(nextVal) {
      var newArgs = args.concat([nextVal])
      if (newArgs.length >= func.arity) 
        return func.apply(null, newArgs)
      else 
        return curried(newArgs)
    }
  }
  return curried([])
}

function log(level, message) {
  print(level.toUpperCase() + ": " + message)
}

var info = curry(log)('INFO');
var warn = curry(log)('WARN');

info('I am partial to curried functions')
warn('May result in shorter code')