var myCheck = apiCheck({

  output: {

    prefix: 'myApp',

    suffix: 'see docs -->',

    docsBaseUrl: 'http://example.com/error-descriptions#'

  }

});

function doSomething(person, options, callback) {

  myCheck.warn([ // you can also do myCheck.throw to throw an exception

    myCheck.shape({

      name: myCheck.shape({

        first: myCheck.string,

        last: myCheck.string

      }),

      age: myCheck.number,

      isOld: myCheck.bool,

      walk: myCheck.func,

      ipAddress: function(val, name, location) {

        if (!/(\d{1,3}\.){3}\d{1,3}/.test(val)) {

          return myCheck.utils.getError(name, location, 'ipAddress');

        }

      },

      childrenNames: myCheck.arrayOf(myCheck.string).optional

    }),

    myCheck.any.optional,

    myCheck.func

  ], arguments, {

    prefix: 'doSomething',

    suffix: 'Good luck!',

    urlSuffix: 'dosomething-api-check-failure'

  });

​

  // do stuff

}

​

var person = {

  name: {

    first: 'Matt',

    last: 'Meese'

  },

  age: 27,

  isOld: false,

  ipAddress: '127.0.0.1',

  walk: function() {}

};

function callback() {}

var options = 'whatever I want because it is an "any" type';

​

console.log('Successful call');

doSomething(person, options, callback);

​

console.log('Successful call (without options)');

doSomething(person, callback); // <-- options is optional

​

console.log('Failed call (without person)');

doSomething(callback); // <-- this would fail because person is not optional

​

person.ipAddress = 'Invalid IP Address!!!';

​

console.log('Failed call (invalid ip address)');

doSomething(person, options, callback);