매우 흥미로운 ChatGPT 사용기

들어가며

요즘 ChatGPT 라는 머신 러닝 기반의 open ai가 개발자들 사이에서 매우 핫하다. 사내에서도 많은 개발자들이 재밌는 질문을 하고 답을 공유해주셨는데, 코드의 품질이 생각외로 높아서 나에게도 매우 흥미롭게 다가왔다. 이번 주 동안 개발하면서 스택오버플로우에 할법할 질문이나 헷갈리는 개념들을 빠르게 질문해보고 결과물을 공유하고자 가져왔다.

 

OpenAI API

OpenAI 구글 계정 연동 이후 ChatGPT에 들어간다면 사용이 가능하다.

example code about try catch statement in typescript

질문 리스트 빠르게 보기

• differences initialize function with usecallback or not
• give me the example when setState doesn't work
• When should I use try catch statement or When should I use then catch statement?
• can I get the example code of both?
• give me the example code about error handling with multiple async await statement
• can you give the code about doSomethingAsync1 function?
• can we use multi try statements in the same function scope in javascript?

differences initialize function with usecallback or not

usecallback을 사용해서 함수를 초기화하는 것과 usecallback을 사용하지 않고 초기화하는 것에 대한 차이점을 물어보았다.

 

The useCallback hook is a hook in React that allows you to memoize a function. This means that the function will only be re-created if one of the dependencies has changed. This can be useful for performance optimization in situations where a component is rendering frequently, and the function in question is expensive to recreate.

 

In contrast, the initialize function is not a hook in React, but rather a term that is commonly used to refer to a function that is used to set up or initialize a component. This function might be called in the useEffect hook, for example, to perform tasks such as fetching data or setting up event listeners.

 

Whether or not you use the useCallback hook with your initialize function will depend on the specific needs of your application. If the function is relatively simple and not expensive to recreate, there may be no need to use useCallback with it. However, if the function is more complex or expensive to recreate, using useCallback with it can help to improve the performance of your application.

give me the example when setState doesn't work

setState가 동작하지 않는 상황에 대한 예시를 질문해보았다.

 

질문을 한 이유?

나의 문제는 state 로 조건부 렌더링을 하고 있는데, 부모에서 state가 이미 falsy 해져서 자식 컴포넌트의 렌더링이 이미 종료됐는데, 자식 컴포넌트 내부에서 다른 동작을 감지하고 진행하려고 하다 보니 의도대로 동작하지 않았다. 그래서 기본으로 돌아가 왜 동작하지 않지를 찾다가 질문을 했던 것 같다.

 

 

setState is a method used in React to update the state of a component and trigger a re-render of the component. In most cases, setState will work as expected and update the state of a component. However, there are a few specific cases when setState may not work as expected.

 

One such case is when setState is called inside a shouldComponentUpdate method. In this case, setState will not trigger a re-render of the component because the shouldComponentUpdate method is used to prevent the component from updating.

 

Another case where setState may not work as expected is when it is called inside a PureComponent. A PureComponent is a type of React component that implements a shouldComponentUpdate method that compares the current and next props and state of the component to determine if a re-render is necessary. If the props and state are the same, shouldComponentUpdate will return false and setState will not trigger a re-render.

 

It's also worth noting that setState is asynchronous, which means that the state of a component may not be updated immediately after setState is called. This can lead to unexpected behavior if you are not careful.

• 이미 렌더링이 종료된 컴포넌트인 경우 부모의 props를 자식으로 전달하지 않는다.
• 자식 컴포넌트에서 콘솔을 찍을 경우 변경된 state 가 props로 전달되지 않았기 때문에 그대로 true로 남는다
• 부모 컴포넌트에서 콘솔을 찍을 경우 state 변경 값을 계속 가지고 있기 때문에 false로 최신 업데이트된다
• 따라서 자식에서 해당 props를 바탕으로 조건을 실행하고 실행하지 않는 것을 상황에 따라 필요하지 않을 가능성이 더 크다
• 일반적으로는 cleanup setstate를 우선 넣어주고 비교하는 것으로 생각하자

When should I use try catch statement or When should I use then catch statement?

질문을 한 이유?

try catch와 then catch의 차이가 궁금해서 질문해보았다. 단순 DB에 http 요청을 보내는 것뿐만 아니라, 외부 sdk에 대한 응답을 await 로 기다려 동작해야 하는 상황에서 then catch와 try catch를 섞어 쓰다 보니 어느 부분에서 에러를 캐치하여 던져줄 수 있는지 확신이 스지 않았기 때문이다.

첫 줄을 읽으면 알 수 있듯이 try-catch는 동기적으로 동작하는 코드에서 에러를 핸들링할 때 주로 쓰이고, then-catch는 비동기적으로 동작하는 코드를 핸들링할 때 주로 쓰인다. 이 부분은 현재 정리 중이므로 다시 글로 남길 생각이다.

 

You can use a try-catch block when you want to handle errors that might occur in synchronous code. This is useful for situations where you want to catch any errors that occur in a certain block of code and handle them in a specific way.

For example, you might use a try-catch block when you are performing a complex calculation or making a network request that might fail. In this case, you can use the try-catch block to catch any errors that occur and handle them gracefully, such as by displaying an error message to the user or retrying the operation.

 

On the other hand, you can use a then-catch block when you want to handle errors that might occur in asynchronous code. This is useful for situations where you are using promises to perform asynchronous operations and you want to handle any errors that might occur.

 

For example, you might use a then-catch block when you are making an asynchronous network request and you want to handle any errors that might occur. In this case, you can use the then-catch block to catch any errors that occur when the promise is resolved and handle them gracefully, such as by displaying an error message to the user or retrying the operation.

 

In general, you should use a try-catch block for synchronous code and a then-catch block for asynchronous code that uses promises. This will help you to catch and handle any errors that might occur in your code in a clear and consistent way.

https://stackoverflow.com/questions/69362121/when-should-i-use-try-catch-instead-of-then-catch

When should I use try catch instead of then catch?

The difference is in how you're handing Promises.

If you're using await to handle the Promise then you wrap it in a try/catch. Think of await as a way to make asynchronous operations semantically similar to synchronous operations.

But if you're not using await and are instead handling the Promise by appending .then() to it then you'd append a .catch() to that chain to catch failures from within the asynchronous operation.

Because a try/catch isn't going to catch an exception that happens from within the asynchronous operation if that operation isn't awaited.

can I get the example code of both?

위와 같이 각 문장에 대한 개념만 설명을 받았기 때문에, 연결해서 질문을 할 경우에 예시 코드 또한 받을 수 있다.

Here is an example of using a try-catch block for synchronous code:

try {
  // Perform a complex calculation
  const result = performCalculation();

  // Use the result of the calculation
  console.log(result);
} catch (err) {
  // Handle any errors that occurred during the calculation
  console.error(err);
}

And here is an example of using a then-catch block for asynchronous code that uses promises:

// Make an asynchronous network request
makeNetworkRequest()
  .then(response => {
    // Use the response from the network request
    console.log(response);
  })
  .catch(err => {
    // Handle any errors that occurred during the network request
    console.error(err);
  });

In both cases, the try-catch block and the then-catch block are used to catch and handle any errors that might occur in the code. This allows you to handle any potential errors in a controlled and predictable way.

• Promise로 핸들링해야 하는 경우 try catch 사용
• Promise로 만든 함수 또한 async await를 통해 순서를 동기적으로 지켜줘야 할 때 try catch 사용
• 그렇지 않을 경우 then catch를 사용해도 무방하다

give me the example code about error handling with multiple async await statement

Here is an example of error handling with multiple async/await statements:

async function example() {
  try {
    const result1 = await doSomethingAsync1();
    const result2 = await doSomethingAsync2(result1);
    const result3 = await doSomethingAsync3(result1, result2);

    console.log(result3);
  } catch (error) {
    console.error(error);
  }
}

In this example, the try block contains multiple await statements that execute asynchronously. If any of these statements throw an error, the error will be caught by the catch block, which will log the error to the console.

can you give the code about doSomethingAsync1 function?

Here is an example of a doSomethingAsync1 function:

async function doSomethingAsync1() {
  return Promise.resolve('Hello, world!');
}

This function simply returns a resolved promise with the string 'Hello, world!'. Note that this is just an example and the actual doSomethingAsync1 function you use in your code may be different.

 

Here is how you would call this function and handle the returned promise:

async function example() {
  try {
    const result = await doSomethingAsync1();
    console.log(result);
  } catch (error) {
    console.error(error);
  }
}

In this example, the doSomethingAsync1 function is called inside the try block, and the returned promise is awaited. If the promise is fulfilled, the resolved value ('Hello, world!' in this case) will be logged to the console. If the promise is rejected, the error will be caught by the catch block and logged to the console.

can we use multi try statements in the same function scope in javascript?

질문을 한 이유?

한 함수 내에서 복합적인 await 문을 처리해야 하는데, 각 비동기 요청에 대한 에러를 핸들링하기 위해 multiple try statements를 고민했다. 그대로 써도 되는지 물어봤는데, 괜찮은 것 같다.

 

Yes, it is possible to use multiple try statements in the same function scope in JavaScript.

 

A try statement in JavaScript consists of a try block, followed by one or more catch blocks, and an optional finally block. The try block contains code that may throw an exception, and the catch block contains code that will handle the exception if it is thrown. The finally block, if present, will always be executed after the try and catch blocks, regardless of whether an exception was thrown or not.

 

Here is an example of how you might use multiple try statements in a function in JavaScript:

function functionWithMultipleTryStatements() {
  try {
    // code that may throw an exception
  } catch (ExceptionType1) {
    // handle exception of type ExceptionType1
  } finally {
    // code that will always be executed
  }

  try {
    // code that may throw an exception
  } catch (ExceptionType2) {
    // handle exception of type ExceptionType2
  } finally {
    // code that will always be executed
  }
}

In this example, the function has two try statements, each with its own catch block and finally block. The first try statement is for handling exceptions of type ExceptionType1, and the second try statement is for handling exceptions of type ExceptionType2.

 

It is important to note that the order of the try statements matters. If an exception is thrown and it is not caught by any of the catch blocks, it will propagate up the call stack and may cause the program to terminate.

 

It is also worth noting that in JavaScript, the try block can be followed by any number of catch blocks, each of which can handle a different type of exception. This allows you to handle different exceptions in different ways, depending on the type of exception that was thrown.

결론

지금도 다양한 질문을 만들어가며 사용하고 있다. 해당 데이터의 종합 결과는 2021년 기준(?) 종합된 데이터라고 들었는데,어쩌면 스택오버플로우보다 더 개인의 입맛에 맞춘 데이터 결과물을 보여주는 것 같아서 흥미로웠다. 내가 더 많이 검색하고 인터렉션을 남겨서 인공지능의 발전을 돕고 많이 도움을 받아야겠다.