const arr1 = [12, 4, 7];

const arr2 = [1, 33, 9];

/**

* @param {string[]|number[]} arr1

* @param {string[]|number[]} arr2

* @return {Array}

*/

function merged(arr1, arr2) {

/** @var {string[]|number[]} newArr */

const newArr = arr1;

for (let i = 0; i < arr2.length; i++) {

newArr.push(arr2[i]);

}

/** alternatives for merging

*

* arr1.concat(arr2)

* [...arr1, ...arr2]

*/

return newArr;

}

/**

* @param {string[]|number[]} arr

* @return {string[]|number[]}

*/

function sorted(arr) {

for (let i = 0; i < arr.length; i++) {

for (let j = i + 1; j < arr.length; j++) {

if (arr[i] > arr[j]) {

const temp = arr[i];

arr[i] = arr[j];

arr[j] = temp;

}

/** alternatives for sorting

*

* arr.sort((a, b) => a - b)

* [arr[i], arr[j]] = [arr[j], arr[i]]

*/

}

}

return arr;

}

console.log(sorted(merged(arr1, arr2)));