why dot notation is not working here, when i try `person.x` inside for loop?

``````
<script>
var x, txt = "";
var person = {name:"John", age:50, city:"New York"};

for (x in person) {
txt += person[x] + " ";
};

document.getElementById("demo").innerHTML = txt;
</script>
``````

You cannot use dot notation with a variable. Dot notation looks for the property x instead of the property that matches the contents of x.

1 Like

For quick reference, here are the challenges where bracket notation, dot notation, and using variables in object lookups are introduced:

2 Likes