生成代码有bug

源代码如下：

for (let index = 0; index < dailyOperation.length; index++) {
            const isLastItem = index === dailyOperation.length - 1

            const element = dailyOperation[index]

            if (!list_content.includes(element.content)) {
              dailyOperation[thePreviousIndex_content].numberOfRepetitions_content = index - thePreviousIndex_content
              list_content.push(element.content)
              thePreviousIndex_content = index
              if (isLastItem) {
                element.numberOfRepetitions_content = 1
              }
            } else {
              if (isLastItem) {
                dailyOperation[thePreviousIndex_content].numberOfRepetitions_content = index - thePreviousIndex_content + 1
              }
            }

            if (!list_matter.includes(element.matter)) {
              dailyOperation[thePreviousIndex_matter].numberOfRepetitions_matter = index - thePreviousIndex_matter
              list_matter.push(element.matter)
              thePreviousIndex_matter = index
              if (isLastItem) {
                element.numberOfRepetitions_matter = 1
              }
            } else {
              if (isLastItem) {
                dailyOperation[thePreviousIndex_matter].numberOfRepetitions_matter = index - thePreviousIndex_matter + 1
              }
            }
          }

生成优化后的代码里，updateRepetitions函数内部的index没有来源