Some more improvements...
julia> n = 5
5
julia> for i = n
println(i)
end
5
julia> using strict
julia> for i = n
println(i)
end
ERROR: MethodError: `start` has no method matching start(::Type{Number})
in start at C:\Users\Eric Forgy\.julia\v0.4\strict\src\strict.jl:24
On Wednesday, December 2, 2015 at 12:05:07 PM UTC+8, Eric Forgy wrote:
>
> It's a start :)
>
> https://github.com/EricForgy/strict.jl
>
>
> julia> using strict
>
> julia> a = 5
> 5
>
> julia> a[1]
> ERROR: MethodError: `getindex` has no method matching getindex(::Type{
> Number}, ::Type{Integer})
> Closest candidates are:
> getindex(::Type{T}, ::Any...)
> getindex{T<:Union{Char,Number}}(::Type{T<:Union{Char,Number}}, ::Range{T
> })
> getindex{T<:Union{Char,Number}}(::Type{T<:Union{Char,Number}}, ::Range{T
> }, ::Range{T}...)
> in getindex at C:\Users\Eric Forgy\.julia\v0.4\strict\src\strict.jl:4
>
>
> On Wednesday, December 2, 2015 at 11:02:45 AM UTC+8, Tim Holy wrote:
>>
>> Likewise, I do see why this is a little troublesome. It's annoying when
>> you
>> mean to write `for i = 1:n` but accidentally write `for i = n`; it's not
>> always an easy bug to find.
>>
>> --Tim
>>
>> On Tuesday, December 01, 2015 06:38:46 PM Eric Forgy wrote:
>> > It bugs me, but only a little, so I won't lose sleep over it :)
>> >
>> > Then again, I wish Julia had a "strict" mode. In strict mode, the
>> language
>> > would be more pure mathematically, e.g. scalars have no indices, the
>> > transpose of a vector is a covector, etc. This bit me recently because
>> if T
>> > <: U, then Array{T} is NOT <: Array{U} although as, sub-modules
>> > <https://en.wikipedia.org/wiki/Module_(mathematics)>, Tmodule <:
>> Umodule.
>> >
>> > Then again, as I'm learning, if we want Julia to do something bad
>> enough,
>> > e.g. have a "strict" mode, we can have it. For example, I could write
>> a
>> > package "strict.jl" where
>> >
>> > using strict
>> >
>> > would kill Base.getindex(::Number) and things like that. That could be
>> cool
>> >
>> > :)
>> >
>> > On Wednesday, December 2, 2015 at 9:38:50 AM UTC+8, Tim Holy wrote:
>> > > On Tuesday, December 01, 2015 03:19:33 PM Eric Forgy wrote:
>> > > > A scalar is distinct from a vector so size(a) = () makes sense.
>> getindex
>> > >
>> > > for
>> > >
>> > > > a scalar does not make sense and should probably be removed on the
>> > >
>> > > grounds
>> > >
>> > > > of mathematical elegance :) Any code that depends on referencing a
>> > >
>> > > scalar
>> > >
>> > > > via an index is probably flawed in the first place.
>> > >
>> > > Conversely, there are many people who seem to want Julia to treat
>> scalars
>> > > and
>> > > 1-vectors indistinguishably (ala Matlab).
>> > >
>> > > For what it's worth, here's a (contrived) example to justify the
>> current
>> > > behavior:
>> > >
>> > > function sum_over_dims(A, dims)
>> > >
>> > > for d in dims
>> > >
>> > > A = sum(A, d)
>> > >
>> > > end
>> > > A
>> > >
>> > > end
>> > >
>> > > sum_over_dims(A, [2,3])
>> > > sum_over_dims(A, 2)
>> > >
>> > > Why should I write sum_over_dims(A, [2]) in the latter case?
>> > >
>> > > Best,
>> > > --Tim
>>
>>
