electronics shop coding challenge explained in javascript

function getMoneySpent(keyboards, drives, s){    // Complete this function    let max = -1;    // I'm trying to get the total number of keyboard and drive    // then compare to the money.    for(let i = 0; i < keyboards.length; i++){        var temp = 0;        for(let j = 0; j < drives.length; j++){            if(keyboards[i] + drives[j] <= s){                temp = keyboards[i] + drives[j];                max = temp > max ? temp : max;            }        }    }    return max;}