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

    sum 390

    salaries 0 

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

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

alert(sum); // 390
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