linear time solution

house_robber.js

var rob = function(profits) {
    let prevMaxProfit = 0;
    let currMaxProfit = 0;
    
    for (let i = 0; i < profits.length; i++) {
        const prevPlusProfit = prevMaxProfit + profits[i];
        prevMaxProfit = currMaxProfit;
        currMaxProfit = Math.max(currMaxProfit, prevPlusProfit);
    }
    
    return currMaxProfit;
};

rob([2, 1, 1, 2, 1, 2])
// output = 6