thread-as: Threading a value, bound to a symbol, through expressions
In alekrutkowski/clojR: Clojure-inspired functions (macros) in R

See https://clojuredocs.org/clojure.core/as->.

1	"as->"(value, symbol, ...)

`value`	An initial value.
`symbol`	An unquoted symbol name which will be replaced by the values returned by the previous expressions.
`...`	The expressions, most likely including the symbol defined in `symbol` (possibly nested).

`as->`(1000, nn,
       mean(c(1,nn)),
       sum(c(nn,5)),
       `-`(nn,13))
# Is transformed to:
# sum(c(mean(c(1, 1000)), 5)) - 13
# an evaluates to 492.5.