Function composition operator?

[jw3126]

Would it be worthwhile to have a function composition operator in julia? I often have code which looks like

map(x -> g(f(x)), iter)

or maybe

hgf(x) = x |> f |> g |> h
map(hgf, iter)

I think it would be nice to write this as

map(g∘f, iter)
map(h∘g∘f, iter)

A basic implementation would be

∘(g,f) = x-> g(f(x))

See also #5236

[tkelman]

#17184 and #17155

[jw3126]

Thanks, I guess there is no need to have another place for discussing this.