We learned about array literals in the first chapter. In this chapter we will learn how to make use of them. Arrays are indexed from zero.

To store or retrieve a value at a particular index of an array, you can use the following syntax:

let groceries = ["Apple", "Banana", "Orange"]
groceries[0] = "Almond"
echo groceries[1]
// Outputs: Banana

As of right now (Amber alpha) the subscript syntax does not work with expressions! This means that you can't evaluate expressions like: foo()[0] yet.

You can also echo an entire array

echo groceries
// Outputs: Almond Banana Orange

To add element to an array you can use the mentioned in the expressions chapter addition operator to merge two arrays together.

let capitals = ["London", "Paris"]
capitals += ["Warsaw"]

let cities = capitals + ["Barcelona", "Florence"]

In order to see more operations on the array data type take a look at the standard library documentation which covers functions such as join, len or sum.

Amber gives you the ability to generate an array of numbers [Num] of certain range. There are two types of ranges:

• .. Exclusive that are from a to b excluding b
• ..= Inclusive that are from a to b including b

echo 0..10
// Outputs: 0 1 2 3 4 5 6 7 8 9

echo 0..=10
// Outputs: 0 1 2 3 4 5 6 7 8 9 10