Added recursive merge function for NamedTuple, addresses JuliaLang#29215

jpsamaroo · Sep 18, 2018 · fbe6d28 · fbe6d28
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diff --git a/base/namedtuple.jl b/base/namedtuple.jl
@@ -241,6 +241,18 @@ merge(a::NamedTuple{()}, b::NamedTuple) = b
 
 merge(a::NamedTuple, b::Iterators.Pairs{<:Any,<:Any,<:Any,<:NamedTuple}) = merge(a, b.data)
 
+"""
+    merge(a::NamedTuple, b::NamedTuple)
+
+Perform a recursive merge of two or more named tuples.
+
+```jldoctest
+julia> merge((a=1, b=2), (b=3, c=(f=1)), (c=(f=2),))
+(a = 1, b = 3, c = (d = 2,))
+```
+"""
+merge(a::NamedTuple, b::NamedTuple...) = merge(merge(a, b[1]), b[2:end]...)
+
 """
     merge(a::NamedTuple, iterable)
 

diff --git a/test/namedtuple.jl b/test/namedtuple.jl
@@ -240,3 +240,6 @@ y = map(v -> (a=v.a, b=v.a + v.b), [(a=1, b=missing), (a=1, b=2)])
 # Iterator constructor
 @test NamedTuple{(:a, :b), Tuple{Int, Float64}}(Any[1.0, 2]) === (a=1, b=2.0)
 @test NamedTuple{(:a, :b)}(Any[1.0, 2]) === (a=1.0, b=2)
+
+# Recursive merge, issue #29215
+@test merge((a=1, b=2), (b=3, c=(d=1,)), (c=(d=2,),)) === (a=1, b=3, c=(d=2,))