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// The reduce() method executes a reducer function (that we provide) on each element of the array, resulting in single output value.

const array = [1, 2, 3, 4, 5];

const reducerFunc = (accumulator, currentValue) => accumulator + currentValue;

// 1 + 2 + 3 + 4 + 5

console.log(array.reduce(reducerFunc));

// expected output: 15

// 5 + 1 + 2 + 3 + 4 + 5

console.log(array.reduce(reducerFunc, 5));

// expected output: 20