Ranges

We've seen ranges a bit earlier, when learning to index into strings. They can be as simple as the following:

julia> r = 1:20 
1:20 
 

As with previous collections, we can index into ranges:

julia> abc = 'a':'z' 
'a':1:'z' 
 
julia> abc[10] 
'j': ASCII/Unicode U+006a (category Ll: Letter, lowercase) 
 
julia> abc[end] 
'z': ASCII/Unicode U+007a (category Ll: Letter, lowercase) 
 

A range can be expanded into its corresponding values by using the splat operator, "...". For example, we can splat it into a tuple:

julia> (1:20...,) 
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20) 
 

We can also splat it into a list:

julia> [1:20...] 
20-element Array{Int64,1}

The same is true for Tuples, which can also be splatted into lists, among other things: [(1,2,3...