JAVASCRIPT

how to add up all numbers in an array

var numbers = [10, 20, 30, 40] 
var sum = 0;
for (var i = 0; i < numbers.length; i++) {  sum += numbers[i]}

add numbers in array

const years = [1, 2, 3, 4]
let total = 0;
for (let i = 0; i < years.length; i++) {

    total += years[i]

}

console.log(total)

//answer willl be 10

how to add up all numbers in an array

const numbers = [10, 20, 30, 40] 
add = (a, b) =>  a + b
const sum = numbers.reduce(add)