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typessyntaxjulia
Arets Paeglis
Arets Paeglis

Reputation: 4006

Multiple typed variables in one line in Julia

Is it possible to define multiple variables with type information in a single line in Julia v0.5+? One can define untyped variables, like so (let's assume the variables are within some function),

x1, x2 = 0.01, 0.5

but adding type information,

local x1 :: Float64, x2 :: Float64 = 0.01, 0.5

fails with an invalid syntax in "local" declaration error. Am I doing something wrong, or is this kind of syntax not supported at all? TIA.

Upvotes: 3

Views: 342

Answers (1)

Fengyang Wang
Fengyang Wang

Reputation: 12051

local isn't needed in most situations, such as a plain function at top-level.

julia> function f()
           x1::Float64, x2::Float64 = 1, 5
           x1, x2
       end
f (generic function with 1 method)

julia> f()
(1.0,5.0)

Where local is needed (that is, where the name would otherwise be bound to an outer function), this syntax won't work as far as I know. See #7314.

Upvotes: 3

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