<section id="description">
  <p>Иногда полезно проверить, существует ли свойство данного объекта или нет. Мы можем использовать метод объектов
    <code>.hasOwnProperty(propname)</code> для определения того, имеет ли этот объект указанное имя свойства.
    <code>.hasOwnProperty()</code> возвращает <code>true</code> или <code>false</code> если свойство найдено или нет.
    <strong>Пример</strong>
  <pre class="language-js"><code>const myObj = {
  top: "hat",
  bottom: "pants"
};

myObj.hasOwnProperty("top"); // true
myObj.hasOwnProperty("middle"); // false</code></pre>
  </p>
</section>

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here

  return "Change Me!";
}

// Test your code by modifying these values
checkObj("gift");


index

Проверка наличия свойств в объекте

Testing Objects for Properties

<code>checkObj("gift")</code> should return  <code>"pony"</code>.

<code>checkObj("pet")</code> should return  <code>"kitten"</code>.

<code>checkObj("house")</code> should return  <code>"Not Found"</code>.

javascript-algorithms-and-data-structures

Basic JavaScript

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if(myObj.hasOwnProperty(checkProp)){
    return myObj[checkProp];  
  }else{
    return "Not Found";
  }
  
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } 
  else {
   return "Not Found";
   }
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
 
 if(myObj.hasOwnProperty(checkProp)){
  return myObj[checkProp];}
  else {return "Not Found"}
}


// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
myObj.hasOwnProperty(checkProp);
return myObj[checkProp] || "Not Found";
  
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
// Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else {
    return 'Not Found';
  }

}

// Test your code by modifying these values
checkObj("gift");

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {

  // Only change code below this line
   if (myObj.hasOwnProperty(checkProp)) {
     return myObj[checkProp];
   } 
   return "Not Found";
  // Only change code above this line
}





// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
if (myObj.hasOwnProperty(checkProp)) {
  return myObj[checkProp]; 
  } else { 
    return "Not Found"};
}
// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
if(myObj.hasOwnProperty(checkProp)){
  return myObj[checkProp];
}
else {
  return "Not Found";
}

}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
if(myObj.hasOwnProperty(checkProp)) {
  return myObj[checkProp];
} else {
  return "Not Found";
}
}
// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
   if (myObj.hasOwnProperty(checkProp)) {
     return myObj[checkProp];
  }
  else {
     return "Not Found";
  }
}

// Test your code by modifying these values
checkObj("gift");

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here

  return myObj.hasOwnProperty(checkProp) ? myObj[checkProp] : "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else{
    return "Not Found";
  }
}

// Test your code by modifying these values
checkObj("gift");

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) return myObj[checkProp];
  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
myObj.hasOwnProperty(checkProp);
return myObj[checkProp] || "Not Found" 
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) return myObj[checkProp];
  else return 'Not Found';
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) { return myObj[checkProp];}

  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
if(myObj.hasOwnProperty(checkProp)){
  return myObj[checkProp];}
  else {
    return 'Not Found';
  }
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else {
    return "Not Found";
  }
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if(!myObj.hasOwnProperty(checkProp))
    return "Not Found";

  return myObj[checkProp];
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  }
  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
 
  
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  }
    return "Not Found";
  
}

// Test your code by modifying these values
checkObj("gift");

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
myObj.hasOwnProperty(checkProp);
  return myObj[checkProp] ||"Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
 if(myObj.hasOwnProperty(checkProp)) {
   return myObj[checkProp];
 } else {
  return "Not Found";
 }
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};


  function checkObj(checkProp) {
    // Your Code Here
    if (myObj.hasOwnProperty(checkProp)) {
      return myObj[checkProp];
    } else { return "Not Found"; }

  return "Change Me!";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else {return 'Not Found'}
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) return myObj[checkProp];

  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if(myObj.hasOwnProperty(checkProp)){
    return myObj[checkProp];
  }

  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else {
    return "Not Found";
  }
  
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)){
    return myObj[checkProp];
  }

  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else {
    return "Not Found";
  }
}

// Test your code by modifying these values
console.log(checkObj("bed"));


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)){
    return myObj[checkProp];
  } 
  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  }
    return "Not Found";
}

// Test your code by modifying these values
console.log(checkObj("gift"));

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp]
  }

  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp) == true) {
    return myObj[checkProp]
  } else {
  return "Not Found";
  }
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
if (myObj.hasOwnProperty(checkProp) === true ){
  return myObj[checkProp]} else{
  return "Not Found"
  }

}
  


// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if(myObj.hasOwnProperty(checkProp)){
    return myObj[checkProp];
  }
  
  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if ((myObj.hasOwnProperty(checkProp)) == true) {
    return myObj[checkProp];
  } 
  return "Not Found";
  return "Change Me!";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else {
    return "Not Found";
  }
  return "Change Me!";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
if (myObj.hasOwnProperty(checkProp) == true) {
  return myObj[checkProp];
} else {
  return "Not Found";
}}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
 if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp]
  } 
  else return "Not Found"
  // Your Code Here
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
 if (myObj.hasOwnProperty(checkProp)){
   return myObj[checkProp]
   } else {
     return "Not Found"
  }

}

console.log(checkObj("gift"));


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)){

    return myObj[checkProp];
}

  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else {
    return "Not Found"
  }
}

// Test your code by modifying these values
console.log(checkObj("gift"));


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  console.log(checkProp)

  return myObj.hasOwnProperty(checkProp) ? myObj[checkProp] : "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp]
  }
  else {
    return "Not Found"// Your Code Here
  }
  return "Change Me!";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp]
  } else {
    return "Not Found"
  }
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  if (myObj.hasOwnProperty(checkProp)){
    return myObj[checkProp];
  }
  else {
    return "Not Found";
  }
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  if (myObj.hasOwnProperty(checkProp)) {
  return myObj[checkProp] ;
 }
 else {
   return "Not Found";
 } // Your Code Here
};

// Test your code by modifying these values
console.log(checkObj("gift"));


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here

  return myObj.hasOwnProperty(checkProp) != (!false) ? "Not Found" : myObj[checkProp];
  // return myObj.hasOwnProperty(checkProp) ? myObj[checkProp] : "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp]
  } else {
    return "Not Found"
  }

  return "Change Me!";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (!myObj.hasOwnProperty(checkProp)) {
    return "Not Found";

  }
  return myObj[checkProp];
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  if(myObj.hasOwnProperty(checkProp)){
    return myObj[checkProp];
  }
  else{
    return "Not Found";
  }
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here

  return myObj.hasOwnProperty(checkProp) != (!false) ? "Not Found" : myObj[checkProp];
}

// Test your code by modifying these values
checkObj("gift");

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
if(myObj.hasOwnProperty(checkProp)){
  return myObj[checkProp];
} else{
  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");
}

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)){
    return myObj[checkProp];
  }else{
    return 'Not Found'
  }
  
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  let r;
  (myObj.hasOwnProperty(checkProp)) ? r = myObj[checkProp] : r = 'Not Found';
  return r;
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  var chk = myObj.hasOwnProperty(checkProp);
  if (chk == true) {
    return myObj[checkProp];
  } else {
    return "Not Found";
  }
}

// Test your code by modifying these values
checkObj("gift");
checkObj("house");

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
if (myObj.hasOwnProperty(checkProp)) {
  return myObj[checkProp]
}
else{
  return "Not Found"
}


// Test your code by modifying these values
checkObj("gift");
}

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp)) {
     return myObj[checkProp];
  }
  return "Not Found";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp]
  } else {
    return "Not Found"
  }
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  if (myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else {
    return "Not Found";

  }

}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  console.log(checkProp in myObj)
  //let test=String(checkProp);
  if (checkProp in myObj){
    return myObj[checkProp];
    //return myObj.test;
  } else return "Not Found";

  //return "Change Me!";
}

// Test your code by modifying these values
checkObj("gift");


// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
  if (myObj.hasOwnProperty(checkProp) ) {
    return myObj[checkProp];
  } 
  else {
    return "Not Found";
  }
}

// Test your code by modifying these values
checkObj("gift");


RichText

Ага! Спасибо, теперь понял =)

Игорь, все верно, для доступа к свойствам объектам можно использовать точечную или скобочную нотацию. Но надо понимать между ними разницу: в скобочной ты щлесь передаешь переменную, которая может иметь разные значения, а в точечной у тебя не переменная передается, а именно само имя переменной. Вот этот урок тебе поможет лучше понять в чем тут твоя ошибка: Доступ к свойствам объектов через переменные.

Уроки

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
 // Your Code Here
 if (myObj.hasOwnProperty(checkProp)) {
 return myObj[checkProp]; //если поменять на return myObj.checkProp; то задание будет не выполнено, хотя в описании ранее было "Вы можете использовать точечную или скобочную нотацию для доступа к объектам."
  } else {
 return "Not Found";
  }
}

// Test your code by modifying these values
checkObj("gift");

FreeCode.Academy

Обсуждение задания "Testing Objects for Properties"

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