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# Length
It's easy in Javascript to know how many characters are in string using the property `.length`.
```js
// Just use the property .length
var size = 'Our lovely string'.length;
```
**Note:** Strings can not be substracted, multiplied or divided.
{% exercise %}
Store in the variable named `size` the length of `str`.
{% initial %}
var str = "Hello World";
var size =
{% solution %}
var str = "Hello World";
var size = str.length;
{% validation %}
assert(size === str.length);
{% endexercise %}