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README.md

练习 3：箭头函数

目标

学会把简单函数改写成箭头函数。

你要练什么

  • 箭头函数
  • 简写返回值
  • 数组映射

任务

  • 把两个普通函数改成箭头函数
  • 用 map 和箭头函数生成课程标签

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