Merge two arrays

const a = [1, 2, 3];
const b = [4, 5, 6];

// 1. .concat()
console.log(a.concat(b)); // [ 1, 2, 3, 4, 5, 6 ]

// 2. spread operator
console.log([...a, ...b]); // [ 1, 2, 3, 4, 5, 6 ]

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