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    $\begingroup$ We could achieve the same effect using Block[{data = Range[5], len := Length[data]}, {len, data}]. But a more conventional solution would be to avoid the deferred execution using the somewhat repetitive but idiomatic Block[{data, len}, data = Range[5]; len = Length[data]; {len, data}]. Incidentally, Block is the analog to Scheme's fluid-let so the sequencing issue is not as likely to arise for Block as it would if instead we were using Module (= Scheme's let). $\endgroup$ Commented Dec 21, 2019 at 20:28
  • $\begingroup$ As I said in a comment to Carl's answer above, I completely missed the fact we can use delayed affectation :/ Anyhow, thanks for the comment @WR, and for mentioning the "idiomatic" way of solving the issue! $\endgroup$ Commented Dec 21, 2019 at 23:03