How to add array to multi array in javascript?

please help me

How to add array to multi array ?

var main_array = [ [9,6,7,3] , [1,7,3,9]] ;

var input_array = [3,7,1,9] ;

result :

var new_array = [ [9,6,7,3] , [1,7,3,9] , [3,7,1,9] ] ;

>Solution :

var main_array = [ [9,6,7,3] , [1,7,3,9]] ;
var input_array = [3,7,1,9] ;    
main_array.push(input_array);
console.log(main_array);

Output:

[ [ 9, 6, 7, 3 ], [ 1, 7, 3, 9 ], [ 3, 7, 1, 9 ] ]