Tuples

Tuples are one of the simplest data types and data structures in Julia. They can have any length and can contain any kind of value—but they are immutable. Once created, a tuple cannot be modified. A tuple can be created using the literal tuple notation, by wrapping the comma-separated values within brackets (...):

(1, 2, 3)

 
julia> ("a", 4, 12.5) 
("a", 4, 12.5) 
 

In order to define a one-element tuple, we must not forget the trailing comma:

julia> (1,) 
(1,) 
 

But it's OK to leave off the parenthesis:

julia> 'e', 2 
('e', 2) 
 
julia> 1, 
(1,) 
 

We can index into tuples to access their elements:

julia> lang = ("Julia", v"1.0") 
("Julia", v"1.0.0") 
 
julia> lang[2] 
v"1.0.0" 
 

Vectorized dot operations also work with tuples:

julia> (3,4) ...