SOURCE

const arr = [1, 2, '3', '4'];
const arrObj = [
    {
        name: 'ljs',
        age: 30
    },
    {
        name: 'huxx',
        age: 30
    }
];

console.log(arr, arrObj);

// const arrShallow = arr.concat();
// const arrShallow = arr.slice();
const arrShallow = [...arr];
arrShallow[1] = 5;

// const arrObjShallow = arrObj.concat();
// const arrObjShallow = arrObj.slice();
const arrObjShallow = [...arrObj];
arrObjShallow[1].age = 40;


console.log(arrShallow, arrObjShallow);
console.log(arr, arrObj);