Logo

Programming-Idioms

  • Pascal
  • C++
  • Elixir
  • JS
  • Groovy

Idiom #220 Create a tuple value

Create t consisting of 3 values having different types.

Explain if the elements of t are strongly typed or not.

let t = [2.5, "hello", -1];

An Array may hold any list of values.
Elements are not strongly typed.
type
  Tuple = record
    a: integer;
    b: string;
    c: boolean;
  end;
var
  t: Tuple;
begin
  t := Default(Tuple);
end.

Elements of type Tuple are strongly typed.
The Default intrinsic will create a variable of type Tuple with all it's members set to their respective default values.
#include <tuple>
std::tuple<float, std::string, bool> t(2.5f, "foo", false);

Strongly typed, can include any primitive or class and be of arbitrary (but fixed) length.
#include <tuple>
auto t = std::make_tuple(2.5f, std::string("foo"), false);

Types are inferred.
let t = 1, 'a', "b"

in OCaml, parenthesis for tuples are optional and only used to disambiguate.
Type inference can determine the type of the tuple without annotation.
New implementation...
< > ⌨
programming-idioms.org 
let t = [2.5, "hello", -1];
type
  Tuple = record
    a: integer;
    b: string;
    c: boolean;
  end;
var
  t: Tuple;
begin
  t := Default(Tuple);
end.

std::tuple<float, std::string, bool> t(2.5f, "foo", false);
auto t = std::make_tuple(2.5f, std::string("foo"), false);
let t = 1, 'a', "b"
var t = (2.5f, "foo", true);
auto entry = tuple!("index", "value", "active")(4, "Hello", true);

auto value = tuple(5, 6.7, "hello");
a, b, c := 2.5, "hello", make(chan int)
t := []any{
	2.5,
	"hello",
	make(chan int),
}
t = (a, b, c)
record Tuple(int a, String b, boolean c) {}
var t = new Tuple(1, "hello", true);
record Tuple(Object ... a) {}
Tuple t = new Tuple("abc", 123, true);
class Tuple {
    String s;
    int i;
    boolean b;
}
record Tuple<A, B, C>(A a, B b, C c) {}
Tuple<String, Integer, Boolean> t
    = new Tuple<>("abc", 123, true);
val t = Triple(2.5, "foo", true)
use constant t => (1, 'two', 3.5);
my $tuple = [1, 'Hello World', {foo => 1}];
t = tuple('abc', 123, true)
t = (2.5, "hello", -1)
t = [2.5, "hello", -1]
let t = (2.5, "hello", -1);
Dim t = (2.5F, "foo", True)