ArrayMethod.ts

const mergeAndSort = (array1: number[], array2: number[]): number[] => {
  array1.length += array2.length;
  for (let i = array1.length - array2.length; i < array1.length; i++) {
    array1[i] = array2[i - array1.length + array2.length];
  }

  for (let i = 0; i < array1.length; i++) {
    for (let j = array1.length; j > i; j--) {
      if (array1[j] < array1[i]) {
        const temp = array1[i];
        array1[i] = array1[j];
        array1[j] = temp;
      }
    }
  }

  return array1;
};

console.log(mergeAndSort([1, 3, 4, 5], [2, 6, 7, 8]));

const findSum = (arr: number[], value: number): number[] => {
  let a: number = 0;
  let b: number = 0;
  for (let i = 0; i < Math.floor(arr.length / 2); i++) {
    for (let j = arr.length; j > Math.floor(arr.length / 2); j--) {
      if (arr[i] + arr[j] === value) {
        (a = arr[i]), (b = arr[j]);
      }
    }
  }
  return [a, b];
};

console.log(findSum([1, 21, 3, 14, 5, 60, 7, 6], 81));