How does Promise chaining help in handling asynchronous operations?
- It simplifies callback hell by allowing sequential execution of asynchronous tasks.
- It increases the complexity of asynchronous code.
- It only works with synchronous operations.
- It requires additional external libraries.
Promise chaining is a technique that allows sequential execution of asynchronous tasks, making the code more readable and maintainable by avoiding callback hell.
In Google Cloud, which load balancer is suitable for distributing traffic globally across multiple regions?
- Global Load Balancer
- Regional Load Balancer
- Internal Load Balancer
- Network Load Balancer
Understanding the capabilities of different load balancers in Google Cloud is essential for designing resilient and efficient architectures that can serve users worldwide. Google Cloud's Global Load Balancer is a key component for achieving global scalability and high availability.
Can Promises help in avoiding callback hell in asynchronous JavaScript code?
- TRUE
- FALSE
- Only in specific cases
- Depends on the browser
Promises play a crucial role in avoiding callback hell in asynchronous JavaScript code. By using promises, you can chain asynchronous operations more cleanly, making the code more readable and maintainable. Option A is correct because Promises are indeed effective in this context.
What distinguishes the Symbol.iterator property in an iterable?
- It uniquely identifies the iterable object
- It defines the iteration logic of the iterable
- It represents the number of iterations
- It is used to check if an object is iterable
In ES6, the Symbol.iterator property is a special symbol used to define the default iterator for an object. The value assigned to this symbol is a function that returns the iterator object, providing the logic for iterating over the object's elements. This allows customizing the iteration behavior for user-defined objects.
In ES6, which method is commonly used as a higher-order function for arrays?
- map()
- concat()
- reduce()
- slice()
The map() method in ES6 is commonly used as a higher-order function for arrays, allowing the transformation of each element with a provided function.
What is tail call optimization in recursive functions and how is it handled in ES6?
- Tail call optimization is a technique where the JavaScript engine optimizes recursive functions to avoid stack overflow errors. In ES6, tail call optimization is not explicitly mandated, but certain engine implementations may provide it.
- Tail call optimization in ES6 can be achieved through the use of proper coding practices, such as making the recursive call the last operation in the function and ensuring no additional processing is performed after the recursive call.
- ES6 introduces the concept of proper tail calls (PTC), allowing some recursive functions to be optimized for tail calls. This optimization is not universally supported across all JavaScript engines.
- Tail call optimization is automatically applied to all recursive functions in ES6, ensuring that stack overflow errors are mitigated, and the recursive calls are optimized for better performance.
Proper tail calls in ES6 involve making the recursive call the last operation in a function. While not all recursive calls benefit from tail call optimization, adhering to PTC principles can enhance performance in situations where tail call optimization is applied.
________ tools are crucial in analyzing and removing unused code through tree shaking.
- Babel
- Linter
- Bundler
- Minifier
Bundlers play a key role in tree shaking. They are responsible for analyzing the dependencies between modules, identifying unused code, and removing it during the build process. Common bundlers like Webpack and Rollup are often configured to perform tree shaking to optimize the final bundle size.
What are the limitations of using the spread operator for deep cloning complex objects?
- It does not handle circular references well.
- It only works for primitive data types.
- It cannot clone objects with prototype chains.
- It cannot clone functions.
The spread operator is limited in deep cloning when dealing with circular references, making it less suitable for complex object structures. Circular references can result in infinite loops during cloning.
_______ is a key feature of Cloud Deployment Manager that allows users to manage deployments as code.
- Infrastructure as Code
- Software Development Kit
- Container Orchestration
- Graphical User Interface
Infrastructure as Code (IaC) is a fundamental concept in modern cloud computing, allowing for automation, consistency, and scalability in infrastructure management.
AI Platform enables users to _______ machine learning models.
- Train
- Deploy
- Monitor
- Visualize
Understanding the capabilities of AI Platform in training machine learning models is crucial for leveraging its full potential in building and refining predictive models for various applications.