JavaScript combination and case explanation

Method 1:

var a = [1,2,3];
var b=[4,5]
a = (b);
(a);
//Here the output is [1, 2, 3 ,4 ,5]

Method 2:

// How to write ES5var arr1 = [0, 1, 2];
var arr2 = [3, 4, 5];
(arr1, arr2);
(arr1)//[0,1,2,3,4,5]

Method 3:

// How to write ES6var arr1 = [0, 1, 2];
var arr2 = [3, 4, 5];
(...arr2);
(arr1)//[0,1,2,3,4,5]

// How to write ES6var arr1 = [0, 1, 2];
var arr2 = [3, 4, 5];
var arr3=[...arr1, ...arr2]
(arr3)//[0,1,2,3,4,5]

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