function arrayPreviousLess(nums) {
  if (nums.length === 0) {
    return nums;
  }

  const previousLess = [-1];

  for (let i = 1; i < nums.length; i++) {
    let found = false;
    for (let j = i - 1; j > -1; j--) {
      if (nums[j] < nums[i]) {
        previousLess.push(nums[j]);
        found = true;
        break;
      }
    }
    if (!found) {
      previousLess.push(-1);
    }
  }

  return previousLess
}



/**
* Test Suite 
*/
describe('arrayPreviousLess()', () => {
    it('shift previous postions from the left to a smaller value or store -1', () => {
        // arrange
        const nums = [3, 5, 2, 4, 5];
        
        // act
        const result = arrayPreviousLess(nums);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toEqual([-1, 3, -1, 2, 4]);
    });
});