Tuples are immutable ordered collections of arbitrary distinct objects, either of the same type or of different types. Typically, tuples are constructed using the
(x, y) syntax.
julia> tup = (1, 1.0, "Hello, World!") (1,1.0,"Hello, World!")
The individual objects of a tuple can be retrieved using indexing syntax:
julia> tup 1 julia> tup 1.0 julia> tup "Hello, World!"
julia> for item in tup println(item) end 1 1.0 Hello, World!
Tuples also support a variety of generic collections functions, such as
julia> reverse(tup) ("Hello, World!",1.0,1) julia> length(tup) 3
julia> map(typeof, tup) (Int64,Float64,String) julia> all(x -> x < 2, (1, 2, 3)) false julia> all(x -> x < 4, (1, 2, 3)) true julia> any(x -> x < 2, (1, 2, 3)) true
The empty tuple can be constructed using
julia> () () julia> isempty(ans) true
However, to construct a tuple of one element, a trailing comma is required. This is because the parentheses (
)) would otherwise be treated as grouping operations together instead of constructing a tuple.
julia> (1) 1 julia> (1,) (1,)
For consistency, a trailing comma is also allowed for tuples with more than one element.
julia> (1, 2, 3,) (1,2,3)