Let's use reduce, map, filter, foreach and be more functional in javascript

console.log([1,2,3,4].reduce((x,y) => { return x  + y })) // 10 
// Elements reduced to one value

console.log([1,2,3,4].map((x) => { return x  + 5 })) // [6,7,8,9] 
// Do something for each value and make a new array

console.log([1,2,3,4].filter((x) => { return x  % 2 === 0 })) // [2,4] 
// Filter the elements and make a new array

const array1 = [1, 2, 3, 4];

array1.forEach(x => { console.log(x)});
// For each loop.