How can you handle errors in the fetch API when using async/await syntax?
- Use try/catch around the fetch call
- Use the .catch() method on the Promise returned by fetch
- Use a custom error handling function passed as a parameter to fetch
- Errors are automatically handled by the fetch API when using async/await
When using async/await with the fetch API, you can handle errors by chaining a .catch() method onto the Promise returned by fetch. This allows you to catch any network or request-related errors and handle them gracefully. Using try/catch around the fetch call is not effective in capturing asynchronous errors that occur within the Promise. The fetch API does not automatically handle errors when using async/await.
What potential issue might arise when using arrow functions in methods within a class definition?
- The "this" context is unpredictable and may lead to bugs.
- Arrow functions cannot be used within class methods.
- Arrow functions always cause memory leaks.
- Arrow functions make the code less readable.
When arrow functions are used in methods within a class, the "this" context is fixed to the outer scope, which may lead to unexpected behavior. This can be problematic when trying to access class properties or methods, potentially introducing bugs. Developers need to be cautious when choosing arrow functions in this context.
What is the default binding of "this" in JavaScript?
- Global object
- Parent object
- Undefined
- Null
The default binding of "this" in JavaScript is the global object. In most cases, when "this" is not explicitly set or bound to an object, it defaults to the global object (e.g., "window" in browsers). This behavior can lead to unexpected results, so it's crucial to be aware of it and handle "this" appropriately in your code.
What was the original name of JavaScript?
- ECMAScript
- JScript
- Java
- LiveScript
JavaScript was originally called "LiveScript" when it was first introduced in Netscape Navigator 2.0 in September 1995. However, it was quickly renamed to "JavaScript" to capitalize on the popularity of Sun Microsystem's Java language.
The "super" keyword in JavaScript is used to call methods on a parent class, and it should be called within the constructor method of the child class, before using the "this" keyword, otherwise it will result in a reference error, stating that "this is not _________.
- Defined
- Valid
- a Function
- Accessible
The "super" keyword in JavaScript is used to call methods on a parent class within the constructor method of the child class. If it is not called before using the "this" keyword, it will result in a reference error, stating that "this is not a function." This highlights the importance of calling "super" before accessing the properties and methods of the parent class.
The _________ event does not necessarily have to be attached to a form element.
- submit
- reset
- change
- keydown
The change event in JavaScript doesn't necessarily have to be attached to a form element. It can also be used with other HTML elements like ,