Consider a scenario where you have an iterable data structure with complex logic for each iteration. How would using a for...of loop simplify or complicate the implementation?
- It would simplify the implementation.
- It would complicate the implementation.
- It would have no impact on the implementation.
- It depends on the specific logic involved.
The correct option is "It would simplify the implementation." The for...of loop is designed to iterate over iterable objects, and its syntax is concise and clear. When dealing with complex logic for each iteration, using for...of can enhance code readability and maintainability by focusing on the logic rather than the mechanics of iteration.
If a property is not found on an object, JavaScript looks up the property on the object's prototype, known as the _________ chain.
- Prototype
- Scope
- Inheritance
- Execution
In JavaScript, the process of searching for a property involves traversing the prototype chain. If the property is not found on the object, it looks up in the prototype chain until it finds the property.
In ES6, what is the difference between declaring methods in a class and in an object literal?
- Methods in a class are enumerable, while methods in an object literal are not
- Methods in a class are prototype methods, while methods in an object literal are not
- There is no difference between declaring methods in a class and in an object literal
- Methods in an object literal have access to the 'super' keyword
The key distinction is that methods in a class are prototype methods, meaning they are shared among all instances of the class. In contrast, methods in an object literal are not shared among instances.
How does error propagation work in a Promise chain?
- Propagates to the nearest catch block
- Propagates to the outermost catch block
- Propagates to the nearest then block
- Propagates to the global error handler
In a Promise chain, errors propagate to the nearest catch block. If there isn't a catch block in the immediate chain, it continues to propagate outward until it finds one. This behavior allows for more granular error handling based on where the error occurs in the chain.
For side effects only, import a module without any exported bindings using import '________';.
- module-name'
- {} from 'module-name'
- from 'module-name'
- module-name';
When importing a module for its side effects only, you can use import 'module-name'; without any specific binding. This is useful when a module has side effects like modifying the global scope.
ES6 allows the use of ________ to dynamically create property names in object literals.
- Template Literals
- Default Parameters
- Rest Parameters
- Spread Operator
Template literals in ES6 provide a powerful way to create strings, allowing dynamic expression evaluation. This feature is often used to create dynamic property names in object literals.
In ES6, can the rest operator be used in conjunction with destructuring to extract specific elements from an array?
- Yes, the rest operator allows extracting specific elements by using the spread syntax.
- No, the rest operator can only be used to extract all elements in an array.
- Yes, the rest operator can be combined with destructuring to extract specific elements.
- No, the rest operator is not compatible with array destructuring.
In ES6, the rest operator can indeed be used in conjunction with array destructuring to extract specific elements. It allows you to capture the remaining elements of an array into a new array variable.
When using default export, you can rename the imported module without using the _________ syntax.
- import customName from
- import as customName from
- import {customName} from
- import default as customName
In ES6, when importing a module with a default export and renaming it, you use the import customName from 'moduleName'; syntax. The as keyword is not required in this context.
What method is used to resume the execution of a generator function?
- resume()
- continue()
- next()
- run()
The correct method to resume the execution of a generator function is next(). This method is called on the Generator object and proceeds to the next yield statement, returning the yielded value. Options a), b), and d) are incorrect and not used for resuming a generator function.
Tagged template literals allow you to parse template literals with a _________ function.
- Regular
- Parse
- Tag
- Transform
In ES6, tagged template literals use a tag function to parse the template literal. This function, often referred to as the tag, allows you to process the template and its interpolated values before producing the final string.