List all items from a for loop with javascript -

i'm looking way list each firstname below loop. loops through each firstname stoping @ last jack , displaying that. want display of them like: john, jane, joe

var person = [{firstname:"john"}, {firstname:"jane"}, {firstname:"jack"}];  (var = 0; < person.length; i++) { document.getelementbyid("demo").innerhtml = person[i].firstname; } 

can advise on how this?

the problem overwriting innerhtml value, instead need append values innerhtml property using '+':

var person = [{firstname:"john"}, {firstname:"jane"}, {firstname:"jack"}]; var demo = document.getelementbyid("demo");  (var = 0, len = person.length; < len; i++) {   demo.innerhtml += person[i].firstname + ' '; } 

check out codepen. have add modifications make code more performant.