3.2. The Strategy Pattern (ok)

C:\xampp\htdocs\php\js\strategy\init.js

define(function(require) {
  'use strict';
  return {
    init: function() {
      var Strategy = require('strategy/strategy'), telValidator = require('strategy/telValidator'), emailValidator = require('strategy/emailValidator'), validator;
      validator = new Strategy();
      console.log(validator.selectValidator(telValidator).validate(12345678911));
      console.log(validator.selectValidator(emailValidator).validate('[e-mail]'));
    }
  };
});

C:\xampp\htdocs\php\js\strategy\strategy.js

define(function() {
  'use strict';
  var Validator = function() {};
  Validator.prototype.selectValidator = function(validator) {
    this.validator = validator;
    return this;
  };
  Validator.prototype.validate = function(value) {
    if (this.validator) {
      return this.validator.validate(value);
    }
    throw ('No validator selected');
  };
  return Validator;
});

C:\xampp\htdocs\php\js\strategy\emailValidator.js

define(function() {
  'use strict';
  return {
    validate: function(value) {
      return value.indexOf('@') !== -1;
    }
  };
});

C:\xampp\htdocs\php\js\strategy\telValidator.js

define(function() {
  'use strict';
  return {
    validate: function(value) {
      return (/^[0-9]{11}$/g).test(value);
    }
  }
});