Ranges and arrays

Ranges come in handy when you have to work with an interval of numbers, for example, one up to thousand: 1:1000. The type of this object, typeof(1:1000), is UnitRange{Int64}. By default, the step is 1, but this can also be specified as the second number; 0:5:100 gives all multiples of 5 up to 100. You can iterate over a range, as follows:

# code from file chapter2\arrays.jl    
for i in 1:2:9 
    println(i) 
end 

This prints out 1, 3, 5, 7, 9 on consecutive lines.

In the previous section on Strings, we already encountered the array type when discussing the split function:

a = split("A,B,C,D",",") 
typeof(a) #> Array{SubString{String},1} 
show(a) #> SubString{String}["A","B","C","D"] 

Julia's arrays are very efficient, powerful, and ...

Get Julia 1.0 Programming now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.