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Airbnb · Javascript
Practice Javascript questions specifically asked in Airbnb interviews – ideal for online test preparation, technical rounds and final HR discussions.
Questions
3
Tagged for this company + subject
Company
Airbnb
View company-wise questions
Subject
Javascript
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Go through each question and its explanation. Use this page for targeted revision just before your Airbnb Javascript round.
If a property isn’t found on the object itself, JavaScript continues searching in the object’s [[Prototype]] chain until it finds the property or reaches null.
const proto = { kind: 'proto' };
const obj = Object.create(proto);
obj.name = 'JS';
console.log(obj.kind); // 'proto' via prototypeFor complete preparation, combine this company + subject page with full company-wise practice and subject-wise practice. You can also explore other companies and topics from the links below.
In JavaScript, objects inherit directly from other objects. Every object has an internal [[Prototype]] pointing to another object (or null). When a property is missing, the engine looks up the chain. This model enables sharing behavior without copying methods to each instance.
const animal = { speak(){ return '...'; } };
const dog = Object.create(animal);
dog.speak = function(){ return 'woof'; };
const beagle = Object.create(dog);
console.log(beagle.speak()); // 'woof' (found on dog, not animal)obj.hasOwnProperty('x') is true only if x is an own property. 'x' in obj returns true if x exists on the object or anywhere in its prototype chain.
const proto = { a: 1 };
const o = Object.create(proto);
o.b = 2;
console.log(o.hasOwnProperty('a')); // false
console.log('a' in o); // true