function arrayPreviousLess(nums) {
    //  write code here.
    let resultArr = [];
    
    for(let i=nums.length-1; i>=0; i--){
       for(let j=i; j>=0; j--){
           if(nums[i] > nums[j]){
               resultArr.unshift(nums[j]);
               break;
           }
           else if(j == 0){
               resultArr.unshift(-1);
           }
       }
    }
    return resultArr;
   
}



/**
* 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]);
    });
});