Re: Javascriptでデザインパターン (その7: Chain of Responsibility) ref: http://qiita.com/ishiduca/items/592afefb0eb721961f82

client.js

function Client () {
    this.validators = [].slice.apply(arguments).filter(flt)
}
function flt (validator) {
    return 'function' === typeof (validator || {}).request
}

Client.prototype.request = function (input) {
    for (var i = 0; i < this.validators.length; i++) {
        this.validators[i].request(input)
    }
}

file0.js

var client = new Client(
    new TyepCheck
  , new MinLengthCheck(min_length)
  , new MaxLengthCheck(max_length)
  , new MainHandler
)

client.request(foo)

main-handler.js

function MainHandler () {}
MainHandler.prototype.request = function (input) {
    console.log('validate ok - "%s"', input)
    return !0
}

main.js

var client = new Client(
    new TypeCheck
  , new MinLengthCheck(4)
  , new MaxLengthCheck(6)
  , new MainHandler
)

test()
test('lg')
test('looooog!!')
test('log')

function test (input) {
    try {
        client.request(input)
    } catch (err) {
        console.error(err)
    }
}

max-length-check.js

function MaxLengthCheck (max_length) {
    this.max_length = max_length
}

MinLengthCheck.prototype.request = function (input) {
    if (this.max_length > input)
        throw new Error('too long')
    return !0
}

min-length-check.js

function MinLengthCheck (min_length) {
    this.min_length = min_length
}

MinLengthCheck.prototype.request = function (input) {
    if (this.min_length < input)
        throw new Error('too short')
    return !0
}

type-check.js

function TypeCheck () {}

TypeCheck.prototype.request = function (input) {
    if ('string' !== typeof input)
        throw new TypeError('"input" must be "string"')
    return !0
}