One of the most fundamental aspects of writing clean, maintainable code is using descriptive, accurate variable names. Unfortunately, many developers do not give their variable names the thought they deserve.

const people = [{ name: "Al", age: 15 }, { name: 'Jane', age: 30 }, { name: 'Walter', age: 20 }]; const totalAge = people.reduce((runningTotal, person) => { return runningTotal + person.age; }, 0); console.log(totalAge);