Symbolic programming with Julia, example using function composition

> julia

julia> f(x) = 2x + 3

f (generic function with 1 method)

julia> g(x) = x^2

g (generic function with 1 method)

# "∘" can be typed by \circ<tab>

julia> @show (f ∘ g)(1)

(f ∘ g)(1) = 5

julia> @show f(g(1))

f(g(1)) = 5

julia> typeof(f ∘ g)

ComposedFunction{typeof(f), typeof(g)}

julia> (f ∘ g)(1) == f(g(1))

true

julia>