strange behavior statement about blog

[meooxx]

example:

       const test = () => {  
           const arr = [1, 2]
           console.log("any strings")  
           [arr[1], arr[2] ] = [arr[2], arr[1]] //error msg pointer to this line 
        }
       const test1 = () => {  
          const arr = [1, 2]
          console.log("any strings");  // comment this line or add a semicolon will works  
          [arr[1], arr[2] ] = [arr[2], arr[1]] //error msg pointer to this line 
       }

       test() // error
       test1() // works

[meooxx]

出问题的那行的原因 因为是[] 开头， 被结合到了 console的那行

 //等同
 console.log('any strings')[arr[0], arr[1]] // 逗号表达式 取arr[1]的值 
      = [arr[1], arr[0]]

因为 console.log() 返回undefined 所以 在undefined[arr[1]] = [arr[1], arr[0]] error
详情 stackoverflow 的提问结果