reduce function example day 21

reduce.js

const numbers = [4,5,9,10];

function reducerSum(acc, next) {
    return acc + next;
}

function reducerDouble(acc, next) {
    acc.push(next * 2);
    return acc;
}

function reducerEven(acc, next) {
    if (next % 2 == 0) {
        acc.push(next);
    }

    return acc;
}

const sum = numbers.reduce(reducerSum, 0);
const doubleArray = numbers.reduce(reducerDouble, []);
const evenArray = numbers.reduce(reducerEven, []);
console.log(evenArray, 'evenArray');