function arrayPreviousLess(nums) {
    //  write code here.
    let res = []
    for(let i = 0; i < nums.length; i++){
        let found = false
        for(let j = i - 1; j >= 0; j--){
            if(nums[j]<nums[i]){
                res.push(nums[j])
                found = true
                console.log(nums[i], nums[j])
                break
            }
        }
        if(!found){
            res.push(-1)
        }
    }
    return res
}



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