# Enumeration
The `for in` statement can loop over all of the property names in an object. The enumeration will include functions and prototype properties.
~~~
var fruit = {
apple: 2,
orange:5,
pear:1
},
sentence = 'I have ',
quantity;
for (kind in fruit){
quantity = fruit[kind];
sentence += quantity+' '+kind+
(quantity===1?'':'s')+
', ';
}
// The following line removes the trailing coma.
sentence = sentence.substr(0,sentence.length-2)+'.';
// I have 2 apples, 5 oranges, 1 pear.
~~~
- Introduction
- Basics
- Comments
- Variables
- Types
- Equality
- Numbers
- Creation
- Basic Operators
- Advanced Operators
- Strings
- Creation
- Concatenation
- Length
- Conditional Logic
- If
- Else
- Comparators
- Concatenate
- Arrays
- Indices
- Length
- Loops
- For
- While
- Do...While
- Functions
- Declare
- Higher order
- Objects
- Creation
- Properties
- Mutable
- Reference
- Prototype
- Delete
- Enumeration
- Global footprint