How do you add a new property to an existing object in JavaScript?
A). object.property = value;
B). object->property = value;
C). object:property = value;
D). object.addProperty('property', value);
What will car['make'] return if var car = {make: 'Ford', model: 'Mustang'};?
A). Ford
B). Mustang
C). Undefined
D). Error
Which method can be used to call a function defined within an object?
A). object.functionName();
B). object->functionName();
C). object::functionName();
D). object.callFunction('functionName');
What does Object.assign(target, ...sources) do?
A). Copies properties from sources to target
B). Compares properties between target and sources
C). Deletes properties in sources
D). Merges properties of sources into target and removes duplicates
Which of the following is a correct way to define an object using an object literal?
A). var car = {make: 'Toyota', model: 'Corolla'};
B). var car = make: 'Toyota', model: 'Corolla';
C). var car = new Object(make: 'Toyota', model: 'Corolla');
D). var car = Object.create(make: 'Toyota', model: 'Corolla');
How do you define a class in JavaScript ES6?
A). class ClassName { constructor() {} }
B). function ClassName() { constructor() {} }
C). class ClassName() { constructor {} }
D). function class ClassName { constructor() {} }
In JavaScript, what keyword is used to define a new object from a constructor function?
A). create
B). construct
C). new
D). object
What will the following code output? console.log(car.make); if var car = {make: 'Honda', model: 'Civic'};
A). Honda
B). Civic
C). Undefined
D). Error
What does Object.keys(obj) return?
A). An array of the values of the object's properties
B). An array of the names of the object's properties
C). The first key of the object
D). The number of properties in the object
How do you define a constructor function for a Car object?
A). function Car(make, model, year) { this.make = make; this.model = model; this.year = year; }
B). Car(make, model, year) { this.make = make; this.model = model; this.year = year; }
C). function create Car(make, model, year) { this.make = make; this.model = model; this.year = year; }
D). function construct Car(make, model, year) { this.make = make; this.model = model; this.year = year; }