function slice(arr) {
let result = {};
for(var i=0; i<arr.length-1; i++){
for(var j=1; j<arr.length; j++){
result[`${i}:${j}`] = arr.slice(i,j);
}
}
return result;
}
const arr = slice([1, '2', 3, '4', 5, '6', 7, '8', 9, '0']);
console.log(arr['2:5']);