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Showing content from https://webplatform.github.io/docs/javascript/operators/in below:

in · WebPlatform Docs

Tests for the existence of a property in an object.

result = property in object

result

Required. Any variable.

property

Required. An expression that evaluates to a string expression.

object

Required. Any object.

The following example shows how to use the in operator:

 var myObject = new Object();
 myObject.name = "James";
 myObject.age = "22";
 myObject.phone = "555 0234";

 if ("phone" in myObject)
    document.write ("property is present");
 else
    document.write ("property is not present");

 

The in operator determines whether an object has a property named property. It also determines whether the property is part of the object’s prototype chain. For more information about object prototypes, see Prototypes and Prototype Inheritance.

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