A disjunction that's more appropriate for validating inputs with better vocabulary & straight-forward failure aggregation.
Validation(a, b) is a disjunction that's more appropriate for validating
inputs, or any use case where you want to aggregate failures. Not only the
Validation provides a better terminology for working with such cases
Right), it also allows one to
easily aggregate failures and successes as an Applicative Functor.
var Validation = require'data.validation'var Success = ValidationSuccessvar Failure = ValidationFailure// Functions that need to do validation return one of two cases://// - A Success with the value they want to propagate.// - Some value representing one or more failures, using a semigroup.// Lists are the more straight-forward semigroup, so we just use them// here.return alength > 6? Successa: /* otherwise */ Failure"Password must have more than 6 characters"return /[\W]/testa? Successa: /* otherwise */ Failure"Password must contain special characters"// To aggregate the failures, we start with a Success case containing// a curried function of arity N (where N is the number of validations),// and we just use an `.ap`-ply chain to get either the value our Success// function ultimately returns, or the aggregated failures.return Success return return aapisPasswordLongEnoughaapisPasswordStrongEnoughaisPasswordValid"foo"// => Validation.Failure([// "Password must have more than 6 characters.",// "Password must contain special characters."// ])isPasswordValid"rosesarered"// => Validation.Failure([// "Password must contain special characters."// ])isPasswordValid"rosesarered$andstuff"// => Validation.Success("rosesarered$andstuff")
The easiest way is to grab it from NPM. If you're running in a Browser environment, you can use Browserify
$ npm install data.validation
If you're not using NPM, Download the latest release, and require
var Validation = require'data.validation'
Download the latest release, and require the
Download the latest release, and load the
file. The properties are exposed in the global
$ git clone git://github.com/folktale/data.validation.git $ cd data.validation $ npm install $ make bundle
This will generate the
dist/data.validation.umd.js file, which you can load in
You can read the documentation online or build it yourself:
$ git clone git://github.com/folktale/data.validation.git $ cd data.validation $ npm install $ make documentation
Then open the file
docs/index.html in your browser.
This library assumes an ES5 environment, but can be easily supported in ES3 platforms by the use of shims. Just include es5-shim :)
Copyright (c) 2013 Quildreen Motta.
Released under the MIT licence.