Be concise.
Be useful.
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Please try to avoid dependencies to third-party libraries and frameworks.
x[e] = truex has type map[E]bool
x[e] = struct{}{}x has type map[E]struct{}
x.add(e);x has type Set
x[e] = trueLua tables work as arrays, maps and sets
Include(x,e);x := x + [e];$x = Set::Scalar->new;
$e = 'an element';
$x->insert($e);Insert supports multiple elements in the argument list.
x.add(e)