Julia Programming Projects

The pipe operator

Reading multiple nested functions can be taxing on the brain. The previous example, collect(keys(attrs(dom.root))), can be rewritten to improve readability using Julia's pipe operator, |>.

For example, the following snippet nests three function calls, each inner function becoming the argument of the outermost one:

julia> collect(keys(attrs(dom.root))) 
3-element Array{AbstractString,1}: 
 "class" 
 "lang" 
 "dir"

This can be rewritten for improved readability as a chain of functions using the pipe operator. This code produces the exact same result:

julia> dom.root |> attrs |> keys |> collect 
3-element Array{AbstractString,1}: 
 "class" 
 "lang" 
 "dir" 

What the |> operator does is that it takes the output of the first value and pipes ...