The code creates a map of integers to their corresponding num values. It then loops through the num values, calculating the distance between each two numbers. The code then returns the distance between each number and the original variable solution.
var solution = function (digits, num) {
let map = new Map();
for (let i = 0; i < digits.length; i++) {
map.set(digits[i], i);
}
let distance = 0;
let current = 0;
for (let i = 0; i < num.length; i++) {
let next = map.get(num[i]);
distance += Math.abs(current - next);
current = next;
}
return distance;
};