成功签入 React 后无法增加值

Question

我在函数（React 事件处理程序）中有一个变量，用于计算用户给出的正确答案的数量。

函数如下：

handleFinishAssessment(event) {
    event.preventDefault();
    console.log("Assessment Finished");
    let correctAnswers = 0;
    let assessmentAnswersObjects = [];
    this.state.assessmentAnswers.map(answersArray =>
      answersArray.map(questionsAnswers =>
        questionsAnswers.map(
          questionAnswer =>
            (assessmentAnswersObjects = [
              ...assessmentAnswersObjects,
              questionAnswer,
            ])
        )
      )
    );
    assessmentAnswersObjects.map(assessmentAnswer =>
      this.state.userAnswers.map(
        answerGiven =>
          answerGiven === assessmentAnswer.answer &&
          assessmentAnswer.is_correct_answer &&
          console.log("Correct Answer") && // it's printed the number of time the check is successful
          correctAnswers++
      )
    );
    console.log("correct answers: ", correctAnswers);
  }

基本上，每次检查守卫遇到正确答案（发生）时，函数都会打印“正确答案”，并且还应该增加 correctAnswers 的值（没有发生）。

为什么会这样？

如何让这个功能发挥作用？

编辑

Answer 1

我认为在你的情况下，通过像下面这样链接条件，在 console.log("Correct Answer") returns undefined 中，所以下一个条件 correctAnswers++ 不会执行，删除 console.log 再检查一次

this.state.userAnswers.map(
    answerGiven =>
      answerGiven === assessmentAnswer.answer &&
      assessmentAnswer.is_correct_answer &&
      //console.log("Correct Answer") && this will return undefined and not going to execute next condition
      correctAnswers++
  )

成功签入 React 后无法增加值

Cannot increment value after successful check in React

javascript

post-increment

reactjs