Brendan Eich wrote:
$loopEnd: {
let d1 = e1, ... dN = eN;
if (cond) {
body;
update;
const $loop = { |d1, ... dN|
if (!cond) break $loopEnd;
body;
update;
$loop(d1, ... dN);
}
$loop(d1, ... dN);
}
}
Notes:
* ... is meta-syntax, not rest/spread syntax.
* I've left out break and continue in the body.
* I'm using a block lambda for fun.
Mutations to the first-iteration d1, ... dN bindings in any closures
in e1...N propagate to the second iteration.
Another note:
* this is a desugaring, so any of d1...N can be destructuring patterns,
and with the structuring shorthand for object literals the bindings
propagate nicely.
Symmetry FTW.
/be
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