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Sum object properties

importance: 5
let salaries = {
  John: 100,
  Ann: 160,
  Pete: 130
};

let sum = 0;
for (let key in salaries) {
  sum += salaries[key];
}

alert(sum); // 390

We have an object storing salaries of our team:

let salaries = {
  John: 100,
  Ann: 160,
  Pete: 130
}

Write the code to sum all salaries and store in the variable sum. Should be 390 in the example above.

If salaries is empty, then the result must be 0.