# Arrays

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Arrays or lists in Lua — is just a special case of Lua table. This is similar to PHP arrays.

Lua array is a table which has serial integer keys. Unlike many other programming languages, index of the first element in Lua array is 1, not 0.

You can define Lua array in the following way:

`numbers = {1, 2, 3, 4, 5}`

You can store values of different types within the same array:

```
items = {100, "Sam", true, function () print("Hello") end}
items[4]()
```

Array length can be optained with `#`

operator:

```
primes = {2, 3, 5, 7, 11}
print(#primes)
```

You can iterate over an array in the following way:

```
primes = {2, 3, 5, 7, 11}
for index, value in ipairs(primes) do
print("primes[" .. index .. "]: " .. value)
end
```

Running the example above you will see:

```
primes[1]: 2
primes[2]: 3
primes[3]: 5
primes[4]: 7
primes[5]: 11
```

As you can see, array index starts with 1.

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Lesson 9

Lesson 11

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### Learning plan

7. Functions

What kind of functions are there and how to write them

How to write tail recursion in Lua properly

9. Strings

How to define and work with strings

10. Arrays

How to deal with arrays or lists

11. Tables

Table is a general Lua data structure, it's all about tables