Description Usage Arguments Examples

See https://clojuredocs.org/clojure.core/cond->. NOTE:
This R version is more powerful (general) than the Clojure version as it is threading the
`obj`

value not only through the right-side expresions but also
the conditions/tests (while in Clojure these are static conditions).

1 | ```
"cond->"(obj, ...)
``` |

`obj` |
An object/value. |

`...` |
An even number of expressions. A set of test/expression pairs. |

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ```
# Adapted from the first example at https://clojuredocs.org/clojure.core/cond->
`cond->`(1, # we start with 1
`==`(1), `+`(1), # 1==1 is true so 1+1 is evaluated and yields 2 which is threaded further
`<`(0), `*`(42), # 2<0 is false so the operation is skipped
`==`(2), `*`(3)) # 2==2 is true so 2*3 is evaluated and it finally yields 6
# A version closer in spirit to the Clojure example -- the constants need to be wrapped
# in anonymous functions or in a function which ignores its first argument
# (see `constant` below):
`cond->`(1, # we start with 1
function(x) TRUE, `+`(1), # the condition is true so 1+1 yields 2
function(x) FALSE, `*`(42), # the condition is false so the operation is skipped
function(x) 2==2, `*`(3)) # 2==2 so it yields 6
constant <- function(ignore_me, v) v
`cond->`(1, # we start with 1
constant(TRUE), `+`(1), # the condition is true so 1+1 yields 2
constant(FALSE), `*`(42), # the condition is false so the operation is skipped
constant(2==2), `*`(3)) # 2==2 so it yields 6
``` |

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