[adrianmsmith]

Yeah I did notice in the examples

    fac: fn { x } { either x = 1 { 1 } { x * fac x - 1 } }
    ; function that calculates factorial

So presumably "either" is the "if" expression.

[anamexis]

"if" is the "if" expression - https://ryelang.org/meet_rye/basics/if_either/

[acjohnson55]

Yeah, but "either" is the if-else construct, so the person you replied to isn't really wrong.