/**

* Reduce; It reduce the complete array into a single result; it use every element in a formula and the result is joined with an acumulator.

* Returns the acumulator

*/

let books = [

"Cien años de soledad",

"Rayuela",

"El padrino",

"Simbolo perdido",

"El Tunel",

"El retrato de Dorian Grey"

]

let numbers = [1, 2, 3, 4, 5];

let addAllNumbers = () => {

let acumulator = numbers.reduce ((curResult, element) => {

return curResult + element;

},0)

console.log(acumulator);

}

let subAllNumbers = () => {

let acumulator = numbers.reduce ((curResult, element) => {

return curResult - element;

});

console.log(acumulator);

}

let showBookshelf = () => {

let myBookshelf = books.reduce((result, book) =>{

return result + `${book}, `;

}, "My Bookshelf is: ");

myBookshelf = myBookshelf.slice(0, -1);

console.log(myBookshelf);

}

addAllNumbers();

subAllNumbers();

showBookshelf();