let insertShiftArray = (array, numTobeInsert) => {

​

    let newArr = []

    let middleOfArr = Math.ceil(array.length/2);

​

    for(let i = 0; i < array.length+1; i++) {

      if(i < middleOfArr) {

        newArr[i] = array[i];

      }

      if(i == middleOfArr) {

        newArr[i] = numTobeInsert; }

      else if(i > middleOfArr) {

        newArr[i] = array[i -1];

      }}

    return newArr;

  };

​