Handle missing values in clamp

Author: ararslan

NEWS.md

@@ -38,6 +38,7 @@ Standard library changes
 * `hasmethod` can now check for matching keyword argument names ([#30712]).
 * `startswith` and `endswith` now accept a `Regex` for the second argument ([#29790]).
 * `retry` supports arbitrary callable objects ([#30382]).
+* `clamp` can now handle missing values ([#31066]).
 
 #### LinearAlgebra
 

base/math.jl

@@ -1070,5 +1070,6 @@ for f in (:(acos), :(acosh), :(asin), :(asinh), :(atan), :(atanh),
           :(log2), :(exponent), :(sqrt))
     @eval $(f)(::Missing) = missing
 end
+clamp(::Missing, lo, hi) = missing
 
 end # module

test/missing.jl

@@ -163,6 +163,8 @@ Base.one(::Type{Unit}) = 1
         @test ismissing(f(missing))
     end
 
+    @test ismissing(clamp(missing, 1, 2))
+
     for T in (Int, Float64)
         @test zero(Union{T, Missing}) === T(0)
         @test one(Union{T, Missing}) === T(1)