# 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 %}