JSFiddle - React, Tailwind, and code Playground

JavaScript

function testArray(a, b) {
    var sum = 0;
    var x = 0;
    for(x in a){
        sum+=a[x]
    }
    for(x in b){
        sum+=b[x]
    }
    return sum
    return testArray([8,1,1,7,4,0],[5,8,5,4,8])
}