Mithril validation utility

m.validator.js

m.validator = function (model, validations) {
  this.errors = {}
  this.validations = validations
  this.model = model
}

m.validator.prototype.hasErrors = function () {
  return Object.keys(this.errors).length
}

m.validator.prototype.hasError = function (prop) {
  return this.errors[prop]
}

m.validator.prototype.clearErrors = function () {
  this.errors = {}
}

m.validator.prototype.validate = function () {
  var self = this

  this.clearErrors()

  Object.keys(this.validations).forEach(function (key) {
    var validator = self.validations[key]
    var value = self.model[key]()
    var result = validator.bind(self.model)(value)

    if (result) {
      self.errors[key] = result
    }
  })

  return self
}

Can you show an example of how you should use this? Thanks!