Anonymous functions

The function f(x, y) at the end of the Defining functions section can also be written with no name, as an anonymous function: (x, y) -> x^3 - y + x * y. We can, however, bind it to a name, such as f = (x, y) -> x^3 - y + x * y, and then call it, for example, as f(3, 2). Anonymous functions are also often written using the following syntax (note the space before (x)):

  function (x) 
      x + 2 
(anonymous function) 
julia> ans(3) 

Often, they are also written with a lambda expression as (x) -> x + 2. Before the stab character (->) are the arguments, and after the stab character we have the return value. This can be shortened to x -> x + 2. A function without arguments would be written as () -> println("hello, Julia").

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.