Dorong elemen array ke naskah array lain

// Same array push
let arr1 = [0, 1, 2];
let arr2 = [3, 4, 5];
arr1.push(...arr2);

// New array push
let arr1 = [1, 2];
let arr2 = [3, 4];
let newArr = arr1.concat(arr2);
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