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Task 52
Total an array with reduce
`reduce` walks an array and carries one running value. It is the cleanest way to add up a column of numbers.
Task
Task: Total an array with reduce. What does this program print?
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const marks = [850, 920, 780, 640];
const total = marks.reduce((sum, mark) => sum + mark, 0);
const average = total / marks.length;
console.log('Total:', total);
console.log('Average:', average);
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