Data structures

Apart from the primitive types, Komodo has three main data structures: Lists, Sets and Dictionaries.

List

Lists are ordered, possibly mutable and non-growable. They can be written exhaustively:

let evens := [0, 2, 4]

Or by comprehension:

let evens := [2*i for i in 0..3]

You can create a new list by putting a new element at the beggining of an existing list:

[5|[1, 2]] = [5, 1, 2]

They can be concatenated with each other:

[1, 2, 3] + [4, 5, 6] = [1, 2, 3, 4, 5, 6]

And multiplied:

[1, 3]*2 = [1, 3, 1, 3]

Sets are unoredered, inmutable and non-growable. They can be written exhaustively:

let Z3 := {0, 1, 2}

Or by comprehension:

let Z3 := {i for i in 0..3}

They can be joined (with the addition operator):

{1, 2} + {1, 3} = {1, 2, 3}

Dictionaries are unordered, inmutable collections of key-value pairs. The pairs can be anything. They can be defined exhaustively:

let dict := {
    5 => 7,
    "1" => 1,
    [] => 0
}