console.log([1,2,3]); // [1, 2, 3]console.log(...[1,2,3]); // 1 2 3
var arr1 = [1,2,3];var arr2 = [4,5,6];// arr1.push(arr2) or [1,2,3, arr2]// console.log(arr1); // [1, 2, 3, [4, 5, 6]]arr1.push(...arr2)console.log(arr1); // [1, 2, 3, 4, 5, 6]
function display(a,b,c){console.log(a+b+c); // 60}display(...[10,20,30]);