I’ve had some time to play with this now and my first piece of feedback is that
given my experience with other languages, the most common usage of closures is
by passing them as arguments to functions.
Compared to the other languages I’m using now I’d say that we should be
inferring more of the context of the receiving function type and not requiring
the programmer to type out the full function header as in the example below
(especially in the case there are no local variables declared).
Sort(function(left, right: Double): integer
begin
if left < right then
result := -1
else if left > right then
result := 1
else
result := 0;
end);
It’s hard to say what the best policy is for Pascal but some combination of the
function/procedure keyword, parameter type names and return type could be
omitted or shortened in various ways.
Given we know the function type from the parameter list we could infer most of
the information and provide a more limited set of syntax, for example like this
(Swift like):
Sort((left, right) begin
if left < right then
result := -1
else if left > right then
result := 1
else
result := 0;
end);
There is even the most limited shorthand (from Swift again) which uses token to
represent the arguments as they are ordered.
Sort(begin
if $0 < right then
result := -1
else if $0 > $1 then
result := 1
else
result := 0;
end);
Regards,
Ryan Joseph
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