functions

Functions can be nested, as demonstrated in the following example:

function a(x) 
    z = x * 2 
    function b(z) 
        z += 1 
    end 
    b(z) 
end 
 
d = 5 
a(d) #=> 11 

A function can also be recursive, that is, it can call itself. To show some examples, we need to be able to test a condition in code. The simplest way to do this in Julia is to use the ternary operator ? of the form expr ? b : c (ternary because it takes three arguments). Julia also has a normal if construct. (Refer to the Conditional evaluation section of Chapter 4, Control Flow.) expr is a condition and, if it is true, then b is evaluated and the value is returned, else c is evaluated. This is used in the following recursive definition to calculate the sum of all the integers up to 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.