input  5 then create 5 arrays in runtime .
                  
                  
                  
                  
                  
                  But can do it using runtime ? 
                  
                  
                  
                  
                  
                  const n=5 //it's a my input
                  
                  
                  For (var i=0 , i < n, i++){
                  
                  
                         var unique_array_name = array + i.toString()
                  
                  
                         unique_array_name =[]
                  
                  
                  }
                  
                  
                  
                  
                  
                  I know this above code wrong
                  
                  
                
const n = 5 const arrays = [] for (let i = 0; i < n; i++) { arrays.push([]) } Now you have n (empty) arrays in the arrays variable.
const n = 5 const arrays = new Array(n)
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