I run into the following problem, the following array: [[1,2,3],[4,5,6],[7,8,9]] I must go through it and get the following result [1, 2,3,4,5,6,7,8,9]. Currently I get the same result. Here my code:

 let main= [[1,2,3],[4,5,6],[7,8,9]]

 let result= [].concat(
   main.map((e)=>{
     return e
   })
 )

 console.log(result)