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# [Jelly], 3 bytes

    Rç/

[Try it online!][TIO-ks66t2g7]

[Jelly]: https://github.com/DennisMitchell/jelly
[TIO-ks66t2g7]: https://tio.run/##y0rNyan8H/c/6PBy/f///xsaAAA "Jelly – Try It Online"

Takes `f` as the helper link. Very basic, `R` casts to range, then `ç/` reduces by the helper link