Headline

An order collection of values without basic operations for mutation

Description

An immutable tuple is a data structure for ordered collections of elements of possibly different types. An immutable tuple can be manipulated in a basic sense like this:

  • Projection: access the i-th component of the tuple.
  • Construction: compose a tuple from the components.
Notably, there is no operation for replacing a component.

Tuples of length 2 are also called pairs.

Tuples of length 3 are also called triples.

Illustration

Pairs in Haskell

Pairs are constructed as follows.

> ("four",2)
("four",2)
> (4, 2)
(4,2)

Projection is applied as follows.

> fst ("four",2)
"four"
> snd (4, 2)
2

There are designated tuple types:

> :t ('x', 'x')
('x', 'x') :: (Char, Char)
> :t ('x', True)
('x', True) :: (Char, Bool)

Tuples of other lengths can be manipulated and typed accordingly.

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