let arr1=['a','b','c']; let arr2=[1,2,3]; let arr3 = [] for(var i = 0;i<arr1.length;i++){ arr3.push([arr1[i],arr2[i]]) } console.log(arr3);//[['a', 1],['b', 2],['c', 3]] let arr1=['a','b','c']; let arr2=[1,2,3]; let arr3 = [] for(var i = 0;i<arr1.length;i++){ arr3.push([arr1[i],arr2[i]]) } console.log(arr3);//[['a', 1],['b', 2],['c', 3]]