How do you check if an object has a property in JavaScript?

You can check if an object has a property in JavaScript using the hasOwnProperty() method or the in operator.

1. hasOwnProperty() method:

   This method returns a boolean value indicating whether the object has the specified property as its own property (not inherited from its prototype chain).

   Here is an example:

   const obj = { name: "John", age: 30 };
   console.log(obj.hasOwnProperty("name")); // true
   console.log(obj.hasOwnProperty("gender")); // false

2. in operator:

   This operator returns a boolean value indicating whether the specified property exists in the object, including properties inherited from its prototype chain.

   Here is an example:

   const obj = { name: "John", age: 30 };
   console.log("name" in obj); // true
   console.log("gender" in obj); // false

   Note that the in operator can also be used to check if an object has an index in an array or a key in a map.

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