Câu hỏi phỏng vấn Javascript
Câu hỏi

When should we use generators in ES6?

Câu trả lời

Generators in ES6 are a powerful feature for managing execution contexts more flexibly by pausing and resuming execution at certain points within a function. They are particularly useful in several scenarios:

  1. Handling Asynchronous Operations: Generators can simplify the control flow of asynchronous code, making it easier to read and maintain. They allow functions to pause execution and wait for asynchronous operations to complete before resuming. This is particularly useful in scenarios where you need to manage complex sequences of asynchronous events or operations without nesting callbacks or relying heavily on promises[2][3][6].

  2. Implementing Iterators: Generators provide a straightforward way to implement custom iterators. They can be used to iterate over data that isn't necessarily stored in memory all at once, such as data that is generated on-the-fly or retrieved in chunks from a database or API. This can be more memory-efficient than storing an entire dataset in memory[1][3][7].

  3. Complex Stateful Loops: In scenarios where you need to maintain state across iterations of a loop without resorting to using external variables, generators can encapsulate state within a function. This is useful in game development or simulations where the state of the system needs to be updated in discrete steps over time[4][6].

  4. Cooperative Multitasking: Generators can be used to implement cooperative multitasking within a single thread by allowing multiple tasks to yield execution to each other. This can be useful in environments where preemptive multitasking is not available or desirable[3][7].

  5. Lazy Evaluation: Generators are excellent for scenarios requiring lazy evaluation, wh...

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What language constructions do you use for iterating over object properties and array items?

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What is the difference between Anonymous and Named functions?

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What's the difference between using let and var to declare a variable in ES6?

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