I think that in 0.4, => is not merely syntax, but a constructor for a
Pair. So you can do
julia> [Pair(i,2*i) for i = 1:3]
3-element Array{Pair{Int64,Int64},1}:
1=>2
2=>4
3=>6
and using the => is just syntactic sugar.
My understanding that [1=>2, 3=>4] is deprecated because it will
eventually construct [Pair(1,2), Pair(3,4)] to be consistent.
(type1=>type2)[...] comprehensions are syntactic sugar for creating
Dicts.
HTH,
Tamas
On Mon, Mar 16 2015, Jim Garrison wrote:
> Bumping this since I am still curious and have been unable to figure out
> the answer.
>
> Is intentional that dict comprehensions (and typed dict comprehensions)
> still use the old syntax for dictionaries?
>
> julia> (Int=>Int)[i=>i for i in 1:2] == Dict{Int,Int}(1=>1, 2=>2)
> true
>
> On Thursday, March 12, 2015 at 9:08:56 AM UTC-7, Jim Garrison wrote:
>>
>> It is well known that the dict syntax in 0.4 has changed
>>
>> julia> [1=>2,3=>4]
>> WARNING: deprecated syntax "[a=>b, ...]".
>> Use "Dict(a=>b, ...)" instead.
>>
>> However, I was surprised to notice that a similar syntax still works for
>> dict comprehensions, without warning:
>>
>> julia> [i => 2i for i = 1:3]
>> Dict{Int64,Int64} with 3 entries:
>> 2 => 4
>> 3 => 6
>> 1 => 2
>>
>> Is this intentional?
>>
