FWIW, when I use them, including “” for the fourth parameter works fine with the ArrayBuild( function, but the ArrayBuild Statement returns an empty array. Both work as described with the parameter completely eliminated.
RA=arraybuild(¶,“”,{datepattern(Date,“yyyy”)},“”)
RA=arraybuild(¶,“”,{datepattern(Date,“yyyy”)})
arraybuild RA,¶,“”,datepattern(Date,“yyyy”)
arraybuild RA,¶,“”,datepattern(Date,“yyyy”),“”
Last line returns “”.