Function.prototype.construct.js

if (!Function.prototype.construct)
  Function.prototype.construct = function(aArgs) {

    if (aArgs.constructor !== Array)
      throw new TypeError("second argument to Function.prototype.construct must be an array");

    var aBoundArgs = Array.prototype.concat.apply([null], aArgs), 
        fBound = this.bind.apply(this, aBoundArgs);
        
    return new fBound();

  }