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stringjuliaisnullorempty

Does a method exist to check if a variable is Nothing or WhiteSpace?

C# has String.IsNullOrWhiteSpace(String), do we have a IsNothingOrWhiteSpace(String)?

Solution

  • A slightly more elegant way than the other answer would be to fully use the multiple dispatch:

    isNullOrWS(::Type{Nothing}) = true
isNullOrWS(::Nothing) = true
isNullOrWS(verify::AbstractString) = isempty(strip(verify))
isNullOrWS(::Any) = false

    This actually results also in a faster assembly code.

    julia> dat = fill(Nothing, 100);

julia> @btime isNullOrWS.($dat);
  174.409 ns (2 allocations: 112 bytes)

julia> @btime IsNullOrWhiteSpace.($dat);
  488.205 ns (2 allocations: 112 bytes)