Using map!:
function func_array_eachrow3!(W, f)
@inbounds for i in 1:size(W, 1)
wi = view(W, i, :)
map!(f[i], wi, wi)
end
W
end
f_array = [sin, cos, sqrt]
W = rand(3, 10)
@btime func_array_eachrow!(V, $f_array) setup=(V=copy(W))
@btime func_array_eachrow3!(V, $f_array) setup=(V=copy(W))
727.948 ns (15 allocations: 1.08 KiB)
182.216 ns (6 allocations: 288 bytes)