Callbacks and Higher-Order Functions

const numbers = [1, 2, 3, 4, 5];
const sum = numbers.reduce((accumulator, current) => {
  return accumulator + current;
}, 0);
console.log(sum);

15
The code will output 15. The reduce() method executes a reducer callback function on each element of the array, resulting in a single output value. It takes two parameters: the callback function and an initial value (in this case, 0). The callback receives an accumulator (which stores the accumulated result) and the current value being processed. In this example, reduce() adds each array element to the accumulator, resulting in the sum of all numbers: 1 + 2 + 3 + 4 + 5 = 15. This demonstrates how reduce() is a powerful higher-order function for aggregating array values.
0
[1, 2, 3, 4, 5]
Error