reduce

reduce.js

const n = [2,4,6,1,7];
x = n.reduce(function (total,el,ind,arr) { 
console.log(`index: ${ind}`)
console.log(`total: ${total}`)
console.log(`el: ${el}`)
console.log(`Arr: ${arr}`)
return total+= el;
},0);
console.log(x) //20