What will be the length of the array after [1, 2, 3].unshift(4, 5);?
- 2
- 3
- 4
- 5
The length of the array will be 5. The unshift() method adds one or more elements to the beginning of an array and returns the new length of the array. In this case, it adds 4 and 5 to the beginning of the array, making it [4, 5, 1, 2, 3], so the length is 5.
To remove a child element, you should use the removeChild method on the _________ element.
- parent
- child
- document
- sibling
To remove a child element from the DOM using JavaScript, you should use the removeChild method on the parent element that contains the child you want to remove. The removeChild method doesn't directly operate on the child element itself.
The _______ pattern allows a new object to be created by cloning an existing object to avoid the overhead of creating an object from scratch.
- Singleton
- Prototype
- Decorator
- Observer
The Prototype pattern allows a new object to be created by cloning an existing object, avoiding the overhead of creating an object from scratch. It involves creating an object as a prototype and then creating new instances by copying that prototype.
Given the short-circuiting nature of logical operators in JavaScript, what will be the output of the expression false && someUndeclaredVariable?
- FALSE
- TRUE
- Throws an error
- undefined
JavaScript's logical operators like && and
How does the await keyword manage the Promise’s resolve value?
- It changes the resolve value to a boolean.
- It extracts the resolve value from the Promise.
- It modifies the Promise's behavior.
- It cancels the Promise.
The 'await' keyword is used in async functions to pause the execution until the Promise is resolved. When the Promise resolves, the 'await' expression returns the resolved value. It doesn't change the value to a boolean or modify the Promise itself. This behavior is crucial for handling asynchronous operations more effectively.
How can Cross-Origin Resource Sharing (CORS) issues be handled when using AJAX?
- Disable CORS in the browser
- Use JSONP for requests
- Send requests with credentials
- Use the 'Access-Control-Allow-Origin' header
Cross-Origin Resource Sharing (CORS) issues when using AJAX can be handled by configuring the server to include the 'Access-Control-Allow-Origin' header in its response. This header specifies which origins are allowed to access the server's resources. You can set it to '*' to allow any origin or specify specific origins. Additionally, if you need to include credentials (e.g., cookies) in your requests, you should set the 'withCredentials' property to true in your AJAX request.
You're developing a game and need to create multiple instances of a player object, each with slightly different properties. Which object creation pattern might be most appropriate to use?
- Prototype Pattern
- Singleton Pattern
- Factory Method Pattern
- Abstract Factory Pattern
In game development, you would often use the Factory Method Pattern. This pattern provides an interface for creating objects but allows subclasses to alter the type of objects that will be created. In the context of a game, you can have a PlayerFactory that creates different types of players with varying properties while maintaining a consistent creation interface.
How does the “for...of” loop differ from the traditional "for" loop?
- It cannot iterate over arrays.
- It can only be used for asynchronous operations.
- It is specifically designed for iterating over arrays and iterable objects.
- It has better performance when iterating over objects.
The "for...of" loop is used for iterating over arrays and iterable objects, providing a simplified syntax compared to the traditional "for" loop. It's particularly useful when dealing with collections of data, offering cleaner code for iteration. Traditional "for" loops are more versatile but require more verbose code for array iteration.
What is "explicit binding" in JavaScript with regard to the "this" keyword?
- Explicit binding refers to manually setting the "this" value for a function using methods like .bind(), .call(), or .apply().
- Explicit binding is when "this" is automatically determined by the JavaScript engine.
- Explicit binding involves using the "this" keyword without any special methods.
- Explicit binding is only applicable to arrow functions.
In JavaScript, "explicit binding" refers to the manual setting of the "this" value for a function. This is done using methods like .bind(), .call(), or .apply(), allowing you to explicitly specify the object that should be treated as "this" within the function. This is especially useful in cases where the default "this" behavior is not what you need.
What does the responseType property of an XMLHttpRequest object determine?
- The data type of the request
- The request method
- The URL of the request
- The timeout for the request
The responseType property of an XMLHttpRequest object determines the expected data type of the response. It allows you to specify whether you expect the response to be in text, JSON, XML, or other formats. Setting this property correctly is important for parsing and handling the response data properly in your JavaScript code.