Rest parametr help pls

JavaScript
1 
const product = (n1, n2, n3) => {
  const args = [n1, n2, n3];
  return args.reduce((a, b) => a * b, 1);
}
console.log(product(2, 4, 6)); //48

I cant understand one simple thing. The end of the 3rd string. What this 1 is doing here?

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2

the reduce method can take a second argument, and that would be the starting value of the accumulator

read here to learn more about the reduce method:

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