is = {
  fun:function(obj){ return typeof obj === "function" },
  obj:function(obj){ return typeof obj === "object" },
  arr:function(obj){ return obj.constructor.toString().slice(9,12) === "Arr" }
};
types = {};

function capitaliseFirstLetter(string)
{
    return string.charAt(0).toUpperCase() + string.slice(1);
}

function clos(k)
{
    var _is = is;
    return function(value)
    {
        if ( !_is[k](value) )
        {
            throw "value \"{value}\" has not type \"{type}\" ".replace('{value}', value.toString()).replace('{type}', k);
        }
        return true;
    };
}

var i;
for (i in is)
{
if ( !is.hasOwnProperty(i) )continue;
types[ "is"    + capitaliseFirstLetter(i) ] = is[i];
types[ "check" + capitaliseFirstLetter(i) ] = clos(i);
}