Async Reduce

Implement an async version of Array.reduce that processes items sequentially.

Requirements:

• Implement asyncReduce that takes array, async reducer, and initial value
• Process items sequentially (wait for each async operation)
• Pass accumulated value and current item to reducer
• Return final accumulated value

Example:

const numbers = [1, 2, 3, 4];
const sum = async (acc, n) => acc + n;

asyncReduce(numbers, sum, 0).then(result => {
  console.log(result); // 10
});