Created
          July 26, 2019 18:47 
        
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  | let arr = [1,[6,7],3,[1,2,3,4, [2,3,4]]]; | |
| function unfoldArray(arr) { | |
| let arrNew = []; | |
| for (let i = 0; i < arr.length; i++) { | |
| if (arr[i].length === undefined) { | |
| arrNew.push(arr[i]); | |
| } else { | |
| arrNew = arrNew.concat(unfoldArray(arr[i])); | |
| } | |
| } | |
| return arrNew; | |
| } | |
| console.log(unfoldArray(arr)); | 
  
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