async.js

const {reduce} = require('async');

this.sumColumn = function (rowsNumber, columnPosition,callback) {
    var total = 0, value;
    reduce(rowsNumber, 0, (acum, i) => {
        browser.getText(ELEMENTS.ROW.locator + ':nth-child(' + i + ') td:nth-child(' + columnPosition + ')',
            result => {
                value = parseInt(JSON.stringify(result.value).replace(/\D/g, ''));
                callback(null, acum + (value || 0));
                console.log('counting... '+acum);
            }
        );
    }, callback);

    for (i = 1; i <= rowsNumber; i++) {



    }
    browser.perform(function(){console.log('outside loop total: '+total)})
    return total;
};


var user = browser.globals.users.SUPERVISOR;
var dwellings = browser.page.dwellings();

browser.page.login().loginUser(user)
    .page.navBar().goToMonitoring()
    .page.monitoring().goToDwellings()
dwellings.clickScope(1)
dwellings.clickScope(1);
var total2 = dwellings.sumColumn(8, 2, (err, result) => {
    console.log(result);
});
browser.perform(function(){console.log('please don\'t screw up: '+total2)})
},