Add filter(func) method (JuliaLang#41173)

Add `filter(func)` method

base/array.jl

@@ -2633,6 +2633,33 @@ function filter!(f, a::AbstractVector)
     return a
 end
 
+"""
+    filter(f)
+
+Create a function that filters its arguments with function `f` using [`filter`](@ref), i.e.
+a function equivalent to `x -> filter(f, x)`.
+
+The returned function is of type `Base.Fix1{typeof(filter)}`, which can be
+used to implement specialized methods.
+
+# Examples
+```jldoctest
+julia> (1, 2, Inf, 4, NaN, 6) |> filter(isfinite)
+(1, 2, 4, 6)
+
+julia> map(filter(iseven), [1:3, 2:4, 3:5])
+3-element Vector{Vector{Int64}}:
+ [2]
+ [2, 4]
+ [4]
+```
+!!! compat "Julia 1.8"
+    This method requires at least Julia 1.8.
+"""
+function filter(f)
+    Fix1(filter, f)
+end
+
 """
     keepat!(a::Vector, inds)
     keepat!(a::BitVector, inds)

test/arrayops.jl

@@ -1501,6 +1501,9 @@ end
     @test isempty(eoa)
 end
 
+@testset "filter curried #41173" begin
+    @test -5:5 |> filter(iseven) == -4:2:4
+end
 @testset "logical keepat!" begin
     # Vector
     a = Vector(1:10)