[julia-users] In these two ways to "create functions", which one is a better way?

[Po Choi]

Given coefficients, say, coeff = [1,2,3]
I want to get a function for the polynomial: f(x) = coeff[1] * x + coeff[1] 
* x^2 + coeff[1] * x^3

First way
create_function(coeff) = x -> sum(coeff .* [x^k for k in 1:length(coeff)]) 

Second way
immutable Myfunction
    coeff::Vector
end
call(f::Myfunction, x) = sum(f.coeff .* [x^k for k in 1:length(f.coeff)])

Then
coeff = [1,2,3]
foo = create_function(coeff)
bar = Myfunction(coeff)

foo(1.2)
bar(1.2)

Question: Which way is better in Julia?