javascript - CoffeeScript curiousity about splat & this implementation -



javascript - CoffeeScript curiousity about splat & this implementation -

so, looking thru code functional & currying driver of it.. seeing convention of splat usage, , though can "see" doing in compiled javascript, have not seen mention of docs etc.. on "..." splat usage coffeescript @ end of line (see below).

for instance, have:

flip = (f) -> (as...) -> f as.reverse()...

which compiles to:

flip = function(f) { homecoming function() { var as; = 1 <= arguments.length ? __slice.call(arguments, 0) : []; homecoming f.apply(null, as.reverse()); }; };

now, understand "as..." beingness used as:

as = 1 <= arguments.length ? __slice.call(arguments, 0) : [];

taking arguments , assigning them "as".

but, not wrapping head around usage here:

-> f as.reverse()... # <-- "..." @ end.

if remove (the '...'), "apply" of compiled goes away.. so, convention here of using "..." @ end. missing concept in coffeescript knowledge.

there's nil special ... beingness @ end of line.

what see here difference between splat parameter , splat argument. ... operator used both cases because related. may confusing, though, since these uses inverses of each other.

as.reverse()... splat argument passed f. compiled javascript uses f.apply break as.reverse() multiple arguments receiver f.

as... splat parameter. compiled javascript uses __slice convert arguments object array within receiver, collect arguments single list.

javascript coffeescript

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