> For the complete documentation index, see [llms.txt](https://codehs.gitbook.io/introcs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://codehs.gitbook.io/introcs/basic-data-structures/array-length-and-looping.md).

# Array Length and Looping Through Arrays

Array Length and Looping Knowing the length of an array is very useful, especially in the context of looping, or iterating.

Length You can find the length of an array using the `length` attribute. An attribute is different than a function. Whereas a function requires parameters and returns a value, an attribute is simply a variable that has been made public to you.

```
var animals = ["cat", "dog", "bird"];
print(animals.length);
```

Output:

```
3
```

Note that we used `animals.length`, NOT `animals.length()`.

Looping When you know the length of an array, you can use a for loop to access each element. The following code prints each element of the `animals` array in order.

```
for (var i = 0; i < animals.length; i += 1) {
    println(animals[i]);
}
```

Output:

```
cat
dog
bird
```