SOURCE

let input = [
    [1,2,3,4,5],
    [14,15,16,17,6],
    [13,20,19,18,7],
    [12,11,10,9,8],
]

function output (input){
    let row = input.length;
    let col = input[0].length;
    let direction = 'right';
    let res = [];
    for(let i=0;i<col;i++){
        for(let j=0;j<row;j++){
            
        }
    }
}