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Collections

Collections let you store and work with multiple values.

Fixed Arrays​

Fixed arrays store a fixed number of values of the same type:

let numbers = [1, 2, 3, 4, 5]
let names = ["Alice", "Bob", "Charlie"]

Accessing Elements​

let numbers = [10, 20, 30, 40, 50]

let first = numbers.get(0)   // 10
let third = numbers.get(2)   // 30
let last = numbers.get(4)    // 50

Array Length​

let numbers = [1, 2, 3, 4, 5]
let count = numbers.length  // 5

Dynamic Lists​

Dynamic lists can grow and shrink as needed:

let mut numbers = List()
numbers.add(1)
numbers.add(2)
numbers.add(3)

List Operations​

let mut fruits = List()
fruits.add("apple")
fruits.add("banana")
fruits.add("orange")

let first_fruit = fruits.get(0)  // "apple"
let count = fruits.length        // 3

Iterating Over Collections​

For Loop with Arrays​

let fruits = ["apple", "banana", "orange"]

for fruit in fruits {
    print(fruit)
}
// Output: apple banana orange

For Loop with Lists​

let mut numbers = List()
numbers.add(10)
numbers.add(20)
numbers.add(30)

for number in numbers {
    print(number)
}
// Output: 10 20 30

Strings as Collections​

Strings can be treated as collections of characters:

let text = "Hello"

for char in text.chars() {
    print(char)
}
// Output: H e l l o

let length = text.length  // 5
let first_char = text.get(0)  // 'H'

What's Next?​