let [, , a] = ["foo", "bar", "baz"]
      console.log('a1', a)
      let [b, ...a] = [1, 2, 3, 4]
      console.log('a2', a)
      let { a } = { bar: 'baz' }
      console.log('a3', a)
      const [a, b, c, d, e] = 'hello'
      console.log('a4', a)