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small two-liner to allow namedtuples to merge multiple arguments. #29362

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small two-liner to allow namedtuples to merge multiple arguments. #29362

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18 changes: 18 additions & 0 deletions base/namedtuple.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -241,6 +241,24 @@ merge(a::NamedTuple{()}, b::NamedTuple) = b

merge(a::NamedTuple, b::Iterators.Pairs{<:Any,<:Any,<:Any,<:NamedTuple}) = merge(a, b.data)

"""
merge(a::NamedTuple, bs::NamedTuple...)

Construct a new named tuple by merging several existing ones. The order of
fields in earlier named tuples are preserved, but values are taken from later
fields in each `b` from bs.

```jldoctest
julia> merge((a=1, b=2, c=3), (b=4, c=5, d=6, e=7), (c=8, e=9, f=9))
(a = 1, b = 4, c = 8, d = 5, e = 9, f = 9)
julia> merge((a=1, b=2, c=3))
(a = 1, b = 2, c = 3)
```
"""
merge(a::NamedTuple, b::NamedTuple, cs::NamedTuple...) = merge(merge(a, b), cs...)
merge(a::NamedTuple) = a


"""
merge(a::NamedTuple, iterable)

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