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Allow function negation -f to work like !f #55920

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Allow function negation -f to work like !f #55920

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23 changes: 23 additions & 0 deletions base/operators.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1153,6 +1153,29 @@ julia> filter(!isletter, str)
!(f::Function) = (!) ∘ f
!(f::ComposedFunction{typeof(!)}) = f.inner #allows !!f === f

"""
-f::Function
When the argument of `-` is a function, it returns `(-) ∘ f`.
See also [`!`](@ref) for boolean negation, and [`∘`](@ref).
# Examples
```jldoctest
julia> map(-abs2, Tuple(-2:2))
(-4, -1, 0, -1, -4)
julia> sum(-log10, [1 0.1; 0.01 0.001]; dims=1)
1×2 Matrix{Float64}:
2.0 4.0
```
!!! compat "Julia 1.12"
This method requires at least Julia 1.12.
"""
-(f::Function) = (-) ∘ f
-(f::ComposedFunction{typeof(-)}) = f.inner #allows -(-f) === f
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This method seems fit for an independent PR. I think it'd be merged easier than the feature addition.


"""
Fix{N}(f, x)
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