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add rand(::Pair) #28704

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add rand(::Pair) #28704

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9 changes: 9 additions & 0 deletions stdlib/Random/src/generation.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -430,3 +430,12 @@ function rand(rng::AbstractRNG, sp::SamplerSimple{<:AbstractString,<:Sampler})::
isvalid_unsafe(str, pos) && return str[pos]
end
end


## random elements from pairs

Sampler(RNG::Type{<:AbstractRNG}, t::Pair, n::Repetition) =
SamplerSimple(t, Sampler(RNG, Bool, n))

rand(rng::AbstractRNG, sp::SamplerSimple{<:Pair}) =
@inbounds return sp[][1 + rand(rng, sp.data)]
6 changes: 6 additions & 0 deletions stdlib/Random/test/runtests.jl
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Expand Up @@ -686,3 +686,9 @@ end
@test Random.gentype(Random.UInt52(UInt128)) == UInt128
@test Random.gentype(Random.UInt104()) == UInt128
end

@testset "rand(::Pair)" begin
@test rand(1=>3) ∈ (1, 3)
@test rand(1=>2, 3) isa Vector{Int}
@test rand(1=>'2', 3) isa Vector{Union{Char, Int}}
end