Varying parameter in a function

I am trying to examine how the solution to an optimization problem changes as some parameters are changed in the objective. As a preliminary step, I am just trying to get comfortable modifying parameters in a function.

Here’s what I tried so far. It seems to work, but I think it may get awkward if there are many parameters or if embedded in an otherwise complex problem. Is there a better approach to this sort of thing (sorry I know that’s a bit vague)?

function f(x,y)
    return x+y
end
function g(y)
    function h(x)
        return f(x,y)
    end
    return h
end

As desired, g(2)(7) produced 9.

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