adds map for Nullable

JuliaLang · Dec 24, 2014 · b48975a · b48975a
1 parent 4814557
commit b48975a
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diff --git a/base/nullable.jl b/base/nullable.jl
@@ -56,3 +56,9 @@ function hash(x::Nullable, h::UInt)
         return hash(x.value, h + nullablehash_seed)
     end
 end
+
+# Specialized map over Nullable
+function map{T}(f::Callable, x::Nullable{T})
+    isnull(x) && return Nullable{T}()
+    Nullable(f(get(x)))
+end
diff --git a/test/nullable.jl b/test/nullable.jl
@@ -243,3 +243,11 @@ for T in types
     @test !isnull(x1.v)
     @test get(x1.v, one(T)) === one(T)
 end
+
+# test map
+@test map(x->x, Nullable{Union()}()) === Nullable{Union()}()
+
+for T in types
+    @test isequal(map(x->x, Nullable{T}()), Nullable{T}())
+    @test map(x->x, Nullable(one(T))) === Nullable(one(T))
+end