I see that julia v0.5 has now generators. That looks promising but the
example given in the docs is not really interesting,
sum(1/n^2 for n = 1:1000)
since we have been able to write from start the shorter and I think as
efficient
sum(n->1/n^2, 1:1000)
My question is, where may/should I use generators?
It seems that I can't always use them when an array is expected, e.g.
julia> reverse([i+1 for i in 'a':'c'])
3-element Array{Char,1}:
'd'
'c'
'b'
julia> reverse(i+1 for i in 'a':'c')
ERROR: MethodError: no method matching
reverse(::Base.Generator{StepRange{Char,Int64},##422#423})
Closest candidates are:
reverse(!Matched::BitArray{1}) at bitarray.jl:1416
reverse(!Matched::String) at strings/string.jl:209
reverse(!Matched::LegacyStrings.ASCIIString) at
/home/harven/.julia/v0.5/LegacyStrings/src/ascii.jl:90
