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Глава 5. Классы, модули, прототипы

Тема 1. instanceOf

  1. Какие из ниже перечисленных выражений истинны.
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
  },
  MailRu = function () {
    this.name = 'MailRu';
  };
MailRuGroup.prototype.numberOfUsers = 100; 
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;

var
  mailRu = new MailRu(),
  mailRuGroup = new MailRuGroup();
1. mailRuGroup.numberOfUsers === mailRu.numberOfUsers
2. mailRu.numberOfUsers === undefined
3. mailRu instanceof MailRuGroup
4. mailRu instanceof MailRu
5. mailRuGroup.name === mailRu.name

Правильные ответы: 1, 3, 4

  1. Какие из ниже перечисленных выражений истинны.
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
  },
  MailRu = function () {
    this.name = 'MailRu';
  };
MailRuGroup.prototype.numberOfUsers = 100; 
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;

var
  mailRu = new MailRu(),
  mailRuGroup = new MailRuGroup();
1. mailRu.numberOfUsers === mailRu.prototype.numberOfUsers
2. mailRu.numberOfUsers === 100
3. mailRu instanceof MailRuGroup
4. mailRuGroup instanceof MailRu
5. mailRu.name === 'MailRuGroup'

Правильные ответы: 2, 3

  1. Какие из ниже перечисленных выражений истинны.
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
  },
  MailRu = function () {
    this.name = 'MailRu';
  };
MailRuGroup.prototype.numberOfUsers = 100; 
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;

var
  mailRu = new MailRu(),
  mailRuGroup = new MailRuGroup();

MailRu.prototype.numberOfUsers = 10;
1. mailRuGroup.numberOfUsers === mailRu.numberOfUsers
2. mailRu.numberOfUsers === 10
3. mailRu instanceof MailRuGroup
4. mailRuGroup instanceof MailRuGroup
5. mailRuGroup.constructor.prototype === mailRu.constructor.prototype

Правильные ответы: 2, 3, 4, 5

  1. Какие из ниже перечисленных выражений истинны.
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
  },
  MailRu = function () {
    this.name = 'MailRu';
  };
MailRuGroup.prototype.numberOfUsers = 100; 
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;

var
  mailRu = new MailRu(),
  mailRuGroup = new MailRuGroup();

MailRu.prototype.numberOfUsers = '100';
1. mailRuGroup.numberOfUsers === mailRu.numberOfUsers
2. mailRu.numberOfUsers === 100
3. mailRu instanceof MailRuGroup
4. mailRu.constructor.prototype.numberOfUsers === mailRuGroup.numberOfUsers
5. mailRu.name === mailRu.constructor.name

Правильные ответы: 3, 4

  1. Какие из ниже перечисленных выражений истинны.
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
  },
  MailRu = function () {
    this.name = 'MailRu';
  };
MailRuGroup.prototype.numberOfUsers = 100; 
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;

var
  mailRu = new MailRu(),
  mailRuGroup = new MailRuGroup();

MailRu.numberOfUsers = 1;
1. mailRuGroup.numberOfUsers === mailRu.numberOfUsers
2. mailRu.numberOfUsers === 1
3. mailRu instanceof MailRuGroup
4. mailRu.constructor.numberOfUsers === 1
5. mailRu.name === 'MailRu'

Правильные ответы: 1, 3

Тема 2. prototype

  1. Что будет в результате выполнения функции?
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
    this.country = 'Russia';
  },
  MailRu = function () {
    MailRuGroup.call(this);
    this.name = 'MailRu';
  };
MailRuGroup.prototype.getTitle = function () {
  return this.name + ' in ' + this.country;
};
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;
MailRuGroup.prototype.getTitle = function () {
  return this.name;
};
var mailRu = new MailRu();
alert(mailRu.getTitle());
  1. MailRu in Russia
  2. MailRuGroup in Russia
  3. MailRu
  4. MailRuGroup
  5. undefined

Правильные ответы: 3

  1. Что будет в результате выполнения функции?
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
    this.country = 'Russia';
  },
  MailRu = function () {
    this.name = 'MailRu';
    MailRuGroup.call(this);
  };
MailRuGroup.prototype.getTitle = function () {
  return this.name + ' in ' + this.country;
};
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;
MailRuGroup.prototype.getTitle = function () {
  return this.name;
};
var mailRu = new MailRu();
alert(mailRu.getTitle());
  1. MailRu in Russia
  2. MailRuGroup in Russia
  3. MailRu
  4. MailRuGroup
  5. undefined

Правильные ответы: 4

  1. Что будет в результате выполнения функции?
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
    this.country = 'Russia';
  },
  MailRu = function () {
    MailRuGroup.call(this);
    this.name = 'MailRu';
    this.getTitle = function () {
      return this.name + ' in ' + this.country;
    };
  };
MailRuGroup.prototype.getTitle = function () {
  return this.name + ' in ' + this.country;
};
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;
MailRuGroup.prototype.getTitle = function () {
  return this.name;
};
var mailRu = new MailRu();
alert(mailRu.getTitle());
  1. MailRu in Russia
  2. MailRuGroup in Russia
  3. MailRu
  4. MailRuGroup
  5. undefined

Правильные ответы: 1

  1. Что будет в результате выполнения функции?
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
    this.country = 'Russia';
  },
  MailRu = function () {
    this.name = 'MailRu';
    MailRuGroup.call(this);
    this.getTitle = function () {
      return this.name + ' in ' + this.country;
    };
  };
MailRuGroup.prototype.getTitle = function () {
  return this.name + ' in ' + this.country;
};
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;
MailRuGroup.prototype.getTitle = function () {
  return this.name;
};
var mailRu = new MailRu();
alert(mailRu.getTitle());
  1. MailRu in Russia
  2. MailRuGroup in Russia
  3. MailRu
  4. MailRuGroup
  5. undefined

Правильные ответы: 2

  1. Что будет в результате выполнения функции?
var
  MailRuGroup = function () {
    this.name = 'MailRuGroup';
    this.country = 'Russia';
  },
  MailRu = function () {
    this.name = 'MailRu';
    MailRuGroup.call(this);
    this.getTitle = function () {
      return this.name + ' in ' + this.country;
    };
  };
MailRuGroup.prototype.getTitle = function () {
  return this.name + ' in ' + this.country;
};
function F() {};
F.prototype = MailRuGroup.prototype;
MailRu.prototype = new F;
MailRuGroup.prototype.getTitle = function () {
  return this.name;
};
var mailRu = new MailRu();
delete mailRu.getTitle;
alert(mailRu.getTitle());
  1. MailRu in Russia
  2. MailRuGroup in Russia
  3. MailRu
  4. MailRuGroup
  5. undefined

Правильные ответы: 4

Тема 3. Конструктор и приватные переменные.

  1. Какие из ниже перечисленных выражений истинны.
function MailRu() {
    var data = {
      name: 'MailRu',
      headOffice: 'Moscow'
    };
    this.getData = function () {
      return data;
    };
    return this;
  }
  MailRu.prototype.setName = function (name) {
    this.data = this.data || {};
    this.data.name = name;
  };
  var mailRu = new MailRu();
1. mailRu.getData().name === 'MailRu'
2. mailRu.getData().name === mailRu.data.name
3. mailRu.setName('MailRuGroup');
   mailRu.getData().name === 'MailRuGroup'
4. mailRu.data === undefined
5. mailRu.getData().name = 'MailRuGroup'
   mailRu.getData().name === 'MailRuGroup'

Правильные ответы: 1, 4, 5

  1. Какие из ниже перечисленных выражений истинны.
  function MailRu() {
    var data = {
      name: 'MailRu',
      headOffice: 'Moscow'
    };
    this.getData = function () {
      return data;
    };
    this.getName = function () {
      return data.name;
    }
    return this;
  }
  MailRu.prototype.setName = function (name) {
    this.data = this.data || {};
    this.data.name = name;
  };
  var mailRu = new MailRu();
1. mailRu.getData().name === mailRu.getName()
2. mailRu.getName() === mailRu.data.name
3. mailRu.setName('MailRuGroup');
   mailRu.getName() === 'MailRuGroup'
4. mailRu.data === undefined
5. mailRu.getData().name = 'MailRuGroup'
   mailRu.getName() === 'MailRuGroup'

Правильные ответы: 1, 4, 5

  1. Какие из ниже перечисленных выражений истинны.
  function MailRu() {
    var data = {
      name: 'MailRu',
      headOffice: 'Moscow'
    };
    this.getData = function () {
      return {
        name: data.name,
        headOffice: data.headOffice
      };
    };
    this.getName = function () {
      return data.name;
    }
    return this;
  }
  MailRu.prototype.setName = function (name) {
    this.data = this.data || {};
    this.data.name = name;
  };
  var mailRu = new MailRu();
1. mailRu.getData().name === mailRu.getName()
2. mailRu.getName() === mailRu.data.name
3. mailRu.setName('MailRuGroup');
   mailRu.getName() === 'MailRuGroup'
4. mailRu.data === undefined
5. mailRu.getData().name = 'MailRuGroup'
   mailRu.getName() === 'MailRuGroup'

Правильные ответы: 1, 4

  1. Какие из ниже перечисленных выражений истинны.
  function MailRu() {
    var data = {
      name: 'MailRu',
      headOffice: 'Moscow'
    };
    this.getData = function () {
      return {
        name: data.name,
        headOffice: data.headOffice
      };
    };
    this.getName = function () {
      return data.name;
    }
    return this;
  }
  MailRu.prototype.setName = function (name) {
    this.data = this.data || {};
    this.data.name = name;
  };
  var
    mailRu = new MailRu(),
    _mailRu = MailRu();
1. mailRu.getData().name === _mailRu.getName()
2. mailRu.getData() === _mailRu.getData()
3. mailRu.setName(_mailRu.getName());
   mailRu.data.name === _mailRu.getName()
4. mailRu.getName() === _mailRu.getName()
5. mailRu.getData().name = 'MailRuGroup'
   mailRu.getName() === 'MailRuGroup'

Правильные ответы: 1, 3, 4

  1. Какие из ниже перечисленных выражений истинны.
  function MailRu() {
    var data = {
      name: 'MailRu',
      headOffice: 'Moscow'
    };
    this.getData = function () {
      return {
        name: data.name,
        headOffice: data.headOffice
      };
    };
    this.getName = function () {
      return data.name;
    }
    return this;
  }
  MailRu.prototype.setName = function (name) {
    this.data = this.data || {};
    this.data.name = name;
  };
  var
    mailRu = new MailRu(),
    _mailRu = MailRu.call(mailRu);
1. mailRu.getData().name === _mailRu.getName()
2. mailRu.getData() === _mailRu.getData()
3. mailRu.setName(_mailRu.getName());
   mailRu.data.name === _mailRu.getName()
4. mailRu === _mailRu
5. mailRu.setName('MailRuGroup');
   _mailRu.data.name === 'MailRuGroup';

Правильные ответы: 1, 3, 4, 5

Тема 4. Object to string

  1. Что выведет на экран пользователя следующий фрагмент кода
  var
    util = {
      year: 2014,
      title: 'MailRuGroup',
      getTitle: function() {
        return this.title + util.year
      }
    },
    MailRu = function () {
      this.title = 'MailRu';
      this.getTitle = util.getTitle.bind(this);
      this.toString = function () {
        return this.getTitle();
      };
    },
    mailRu = new MailRu();

  MailRu.prototype.toString = function () {
    return this.getTitle() + ' in Russia';
  };

  alert(mailRu);
  delete mailRu.toString;
  alert(mailRu);
  delete mailRu.toString;
  alert(mailRu);
  1. [object Object]
    [object Object]
    [object Object]
  2. [object Function]
    [object Function]
    [object Function]
  3. MailRu2014
    MailRu2014 in Russia
    MailRu2014 in Russia
  4. MailRu2014
    MailRu2014 in Russia
    undefined is not a function
  5. MailRu2014
    MailRu2014 in Russia
    [object Object]

Правильные ответы: 3

  1. Что выведет на экран пользователя следующий фрагмент кода
 var
   util = {
     year: new function () {
       this.toString = function () {
         return 2014;
       };
     },
     title: 'MailRuGroup',
     getTitle: function() {
       return this.title + util.year
     }
   },
   MailRu = function () {
     this.title = 'MailRu';
     this.getTitle = util.getTitle.bind(this);
     this.toString = function () {
       return this.getTitle();
     };
   },
   mailRu = new MailRu();

 MailRu.prototype.toString = function () {
   return this.getTitle() + ' in Russia';
 };

 alert(mailRu);
 delete mailRu.toString;
 alert(mailRu);
 delete mailRu.toString;
 alert(mailRu);
  1. [object Object]
    [object Object]
    [object Object]
  2. [object Function]
    [object Function]
    [object Function]
  3. MailRu2014
    MailRu2014 in Russia
    MailRu2014 in Russia
  4. MailRu2014
    MailRu2014 in Russia
    undefined is not a function
  5. MailRu2014
    MailRu2014 in Russia
    [object Object]

Правильные ответы: 3

  1. Что выведет на экран пользователя следующий фрагмент кода
 var
   util = {
     year: +function () {return 2014;}(),
     title: 'MailRuGroup',
     getTitle: function() {
       return this.title + util.year
     }
   },
   MailRu = function () {
     this.title = 'MailRu';
     this.getTitle = util.getTitle.bind(this);
     this.toString = function () {
       return this.getTitle();
     };
   },
   mailRu = new MailRu();

 MailRu.prototype.toString = function () {
   return this.getTitle() + ' in Russia';
 };

 alert(mailRu);
 delete mailRu.toString;
 alert(mailRu);
 delete mailRu.toString;
 alert(mailRu);
  1. [object Object]
    [object Object]
    [object Object]
  2. [object Function]
    [object Function]
    [object Function]
  3. MailRu2014
    MailRu2014 in Russia
    MailRu2014 in Russia
  4. MailRu2014
    MailRu2014 in Russia
    undefined is not a function
  5. MailRu2014
    MailRu2014 in Russia
    [object Object]

Правильные ответы: 3

  1. Что выведет на экран пользователя следующий фрагмент кода
 var
   util = {
     year: +function () {return 2014;}(),
     title: 'MailRuGroup',
     getTitle: function() {
       return this.title + util.year
     }
   },
   MailRu = function () {
     this.title = 'MailRu';
     this.getTitle = util.getTitle.bind(this);
     this.toString = function () {
       return this.getTitle();
     };
   },
   mailRu = new MailRu();

 MailRu.prototype.toString = function () {
   return this.getTitle() + ' in Russia';
 };

 alert(mailRu);
 delete mailRu.toString;
 alert(mailRu);
 delete mailRu.toString;
 alert(mailRu);
  1. [object Object]
    [object Object]
    [object Object]
  2. MailRuGroup
    MailRuGroup2014 in Russia
    MailRuGroup2014 in Russia
  3. MailRu2014
    MailRu2014 in Russia
    MailRu2014 in Russia
  4. MailRu2014
    MailRu2014 in Russia
    undefined is not a function
  5. MailRu2014
    MailRu2014 in Russia
    [object Object]

Правильные ответы: 3

  1. Что выведет на экран пользователя следующий фрагмент кода
 var
   util = {
     year: new function () {
       this.toString = function () {
         return 2014;
       };
     },
     title: 'MailRuGroup',
     getTitle: function() {
       return this.title + util.year
     }
   },
   MailRu = function () {
     this.title = 'MailRu';
     this.getTitle = util.getTitle.bind(this);
     this.toString = function () {
       return this.getTitle();
     };
   },
   mailRu = new MailRu();

 MailRu.prototype.toString = function () {
   return this.getTitle() + ' in Russia';
 };

 alert(mailRu);
 delete mailRu.toString;
 alert(mailRu);
 delete mailRu.toString;
 alert(mailRu);
  1. [object Object]
    [object Object]
    [object Object]
  2. MailRuGroup
    MailRuGroup2014 in Russia
    MailRuGroup2014 in Russia
  3. MailRu2014
    MailRu2014 in Russia
    MailRu2014 in Russia
  4. MailRu2014
    MailRu2014 in Russia
    undefined is not a function
  5. MailRu2014
    MailRu2014 in Russia
    MailRuGroup2014 in Russia

Правильные ответы: 3

Тема 5. Заимствование методов

  1. Какие из нижеперечисленных выражений истинны?
  var
    mailRuGroup = function () {
      this.title = 'MailRuGroup';
      this.numberOfEmployee = 5000;
      this.getNumberOfEmployee = function () {
        return this.numberOfEmployee;
      };
      this.getTitle = function () {
        return this.title;
      };
      return this;
    },
    MailRu = function () {
      this.title = 'MailRu';
      this.numberOfEmployee = 1000;
      mailRuGroup.call(MailRu.prototype);
    },
    mailRu = new MailRu();
        
1. mailRu.getTitle() === 'MailRu'
2. mailRu.getTitle() === 'MailRuGroup'
3. mailRu.getNumberOfEmployee === undefined
4. mailRu.getNumberOfEmployee() === 5000
5. mailRu.getNumberOfEmployee() === 1000

Правильные ответы: 1, 5

  1. Какие из нижеперечисленных выражений истинны?
  var
    mailRuGroup = function () {
      this.title = 'MailRuGroup';
      this.numberOfEmployee = 5000;
      this.year = 2014;
      this.getNumberOfEmployee = function () {
        return this.numberOfEmployee;
      };
      this.getTitle = function () {
        return this.title;
      };
      return this;
    },
    MailRu = function () {
      this.title = 'MailRu';
      this.numberOfEmployee = 1000;
      this.year = 2014;
      mailRuGroup.call(MailRu.prototype);
    },
    mailRu = new MailRu();
    
  MailRu.prototype.getTitle = function () {
    return this.title + this.year;
  };   
1. mailRu.getTitle() === 'MailRu'
2. mailRu.getTitle() === 'MailRuGroup'
3. mailRu.getTitle() === 'MailRu2014'
4. mailRu.getNumberOfEmployee() === 5000
5. mailRu.getNumberOfEmployee() === 1000

Правильные ответы: 3, 5

  1. Какие из нижеперечисленных выражений истинны?
  var
    mailRuGroup = function () {
      this.title = 'MailRuGroup';
      this.numberOfEmployee = 5000;
      this.year = 2014;
      this.getNumberOfEmployee = function () {
        return this.numberOfEmployee;
      };
      this.getTitle = function () {
        return this.title;
      };
      return this;
    },
    MailRu = function () {
      this.title = 'MailRu';
      this.numberOfEmployee = 1000;
      this.year = 2014;
      mailRuGroup.call(MailRu);
    },
    mailRu = new MailRu();
    
  MailRu.prototype.getTitle = function () {
    return this.title + this.year;
  };   
1. mailRu.getTitle() === 'MailRu'
2. mailRu.getNumberOfEmployee === undefined
3. mailRu.getTitle() === 'MailRu2014'
4. mailRu.getNumberOfEmployee() === 5000
5. mailRu.getNumberOfEmployee() === 1000

Правильные ответы: 2, 3

  1. Какие из нижеперечисленных выражений истинны?
  var
    mailRuGroup = function () {
      this.title = 'MailRuGroup';
      this.numberOfEmployee = 5000;
      this.getNumberOfEmployee = function () {
        return this.numberOfEmployee;
      };
      this.getTitle = function () {
        return this.title;
      };
      return this;
    },
    MailRu = function () {
      this.title = 'MailRu';
      this.numberOfEmployee = 1000;
      mailRuGroup.call(MailRu);
    },
    mailRu = new MailRu();
        
1. mailRu.getTitle() === 'MailRu'
2. mailRu.getTitle() === 'MailRuGroup'
3. mailRu.getNumberOfEmployee === undefined
4. mailRu.getTitle === undefined
5. mailRu.getNumberOfEmployee() === 1000

Правильные ответы: 3, 4

  1. Какие из нижеперечисленных выражений истинны?
  var
    mailRuGroup = function () {
      this.title = 'MailRuGroup';
      this.numberOfEmployee = 5000;
      this.getNumberOfEmployee = function () {
        return this.numberOfEmployee;
      };
      this.getTitle = function () {
        return this.title;
      };
      return this;
    },
    MailRu = function () {
      this.title = 'MailRu';
      this.numberOfEmployee = 1000;
    },
    mailRu = new MailRu();
  mailRuGroup.call(mailRu);
  MailRu.prototype.getTitle = function () {
    return this.title + this.year;
  };  
1. mailRu.getTitle() === 'MailRu'
2. mailRu.getTitle() === 'MailRuGroup'
3. mailRu.getNumberOfEmployee === undefined
4. mailRu.getNumberOfEmployee() === 5000
5. mailRu.getNumberOfEmployee() === 1000

Правильные ответы: 2, 4